There are b boys and g girls participating in Olympiad of Metropolises. There will be a board games tournament in the evening and n participants have accepted the invitation. The organizers do not know how many boys and girls are among them.

Organizers are preparing red badges for girls and blue ones for boys.

Vasya prepared n+1 decks of badges. The i-th (where i is from 0 to n, inclusive) deck contains i blue badges and n-i red ones. The total number of badges in any deck is exactly n.

Determine the minimum number of decks among these n+1 that Vasya should take, so that there will be a suitable deck no matter how many girls and boys there will be among the participants of the tournament.

Input

The first line contains an integer b (1 ≤ b ≤ 300), the number of boys. 

The second line contains an integer g (1 ≤ g ≤ 300), the number of girls. 

The third line contains an integer n (1 ≤ n ≤ b + g), the number of the board games tournament participants.

Output

Output the only integer, the minimum number of badge decks that Vasya could take.

Examples

Input


5
6
3


Output


4


Input


5
3
5


Output


4

Note

In the first example, each of 4 decks should be taken: (0 blue, 3 red), (1 blue, 2 red), (2 blue, 1 red), (3 blue, 0 red).

In the second example, 4 decks should be taken: (2 blue, 3 red), (3 blue, 2 red), (4 blue, 1 red), (5 blue, 0 red). Piles (0 blue, 5 red) and (1 blue, 4 red) can not be used.
import java.io.*;
import java.util.*;
 
public class tr1 {
	static PrintWriter out;
	static StringBuilder sb;
	static int inf = (int) 1e9;
	static long mod = (long) 1e9 + 7;
	static int[] si;
	static ArrayList<Integer> primes;
	static HashSet<Integer> pr;
	static int n, k, m;
	static boolean[] in;
	static HashMap<Integer, Integer> factors;
	static HashSet<Integer> f;
	static long[] fac;
	static int[] l, r;
	static long[][] memo;
	static int[] a;
	static ArrayList<pair>[] ad;
	static HashMap<Integer, Integer> hm;
	static pair[] ed;
	static ArrayList<Integer>[] np;
	static TreeMap<pair, Integer> tm;
	static int[] ans, h1, h2;
	static char[] h;
	static pair[]mm;
   
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		out = new PrintWriter(System.out);
		int p=sc.nextInt();
		int g=sc.nextInt();
		int n=sc.nextInt();
		int ans=0;
		for(int i=0;i<=p;i++) {
			for(int j=0;j<=g;j++) {
				if(i+j==n) {
					ans++;
					//System.out.println(i+" "+j);
				}
			}
		}
		out.println(ans);
		out.flush();
	}
	static int c = 0;
	static boolean ff;
	static Queue<StringBuilder> sq;
 
	static void sol(int i) {
		// System.out.println(i+" i");
		if (i == 0) {
			if (ff) {
				sol(i + 1);
			}
		} else if (i == n) {
			sb = new StringBuilder();
			for (int l : ans)
				sb.append(l + "");
			c++;
			// System.out.println(c);
			sq.add(sb);
			if (c == k)
				ff = false;
		} else {
			for (int y = 0; y < np[i].size(); y++) {
				ans[np[i].get(y)] = 1;
				if (ff) {
					sol(i + 1);
					ans[np[i].get(y)] = 0;
				}
				if (!ff)
					return;
			}
		}
	}
 
	static class pair  implements Comparable<pair>{
		int x;
		int y;
		int num;
 
		pair(int f, int t, int n) {
			x = f;
			y = t;
			num = n;
		}
 
		public String toString() {
			return x + " " + y + " " + num;
		}

		@Override
		public int compareTo(pair o) {
			return num-o.num;
		}
	}
 
	public int[] merge(int[] d, int st, int e) {
		if (st > e)
			return null;
		if (e == st) {
			int[] ans = { d[e] };
			return ans;
		}
		int mid = (st + e) / 2;
		int[] ans = new int[e - st + 1];
		int[] ll = merge(d, st, mid);
		int[] rr = merge(d, mid + 1, e);
		if (ll == null)
			return rr;
		if (rr == null)
			return ll;
		int iver = 0;
		int idxl = 0;
		int idxr = 0;
		for (int i = st; i <= e; i++) {
			if (ll[idxl] < rr[idxr]) {
 
			}
		}
		return ans;
	}
 
	public static class pair1 implements Comparable<pair1> {
		int a;
		int idx;
 
		pair1(int a, int i) {
			this.a = a;
			idx = i;
		}
 
		public String toString() {
			return a + " " + idx;
		}
 
		@Override
		public int compareTo(pair1 o) {
			return o.a - a;
		}
	}
 
	public static class pair2 implements Comparable<pair2> {
		int a;
		int idx;
 
		pair2(int a, int i) {
			this.a = a;
			idx = i;
		}
 
		public String toString() {
			return a + " " + idx;
		}
 
		@Override
		public int compareTo(pair2 o) {
			// TODO Auto-generated method stub
			return idx - o.idx;
		}
	}
 
	static int inver(long x) {
		int a = (int) x;
		int e = (13 - 2);
		int res = 1;
		while (e > 0) {
			if ((e & 1) == 1) {
				// System.out.println(res*a);
				res = (int) ((1l * res * a) % 13);
			}
			a = (int) ((1l * a * a) % 13);
			e >>= 1;
		}
		// out.println(res+" "+x);
		return res % 13;
	}
 
	static int atMostSum(int arr[], int n, int k) {
		int sum = 0;
		int cnt = 0, maxcnt = 0;
 
		for (int i = 0; i < n; i++) {
 
			// If adding current element doesn't
			// cross limit add it to current window
			if ((sum + arr[i]) <= k) {
				sum += arr[i];
				cnt++;
			}
 
			// Else, remove first element of current
			// window and add the current element
			else if (sum != 0) {
				sum = sum - arr[i - cnt] + arr[i];
			}
 
			// keep track of max length.
			maxcnt = Math.max(cnt, maxcnt);
		}
		return maxcnt;
	}
 
	public static int[] longestSubarray(int[] inp) {
		// array containing prefix sums up to a certain index i
		int[] p = new int[inp.length];
		p[0] = inp[0];
		for (int i = 1; i < inp.length; i++) {
			p[i] = p[i - 1] + inp[i];
		}
 
		// array Q from the description below
		int[] q = new int[inp.length];
		q[inp.length - 1] = p[inp.length - 1];
		for (int i = inp.length - 2; i >= 0; i--) {
			q[i] = Math.max(q[i + 1], p[i]);
		}
		int a = 0;
		int b = 0;
		int maxLen = 0;
		int curr;
		int[] res = new int[] { -1, -1 };
		while (b < inp.length) {
			curr = a > 0 ? q[b] - p[a - 1] : q[b];
			if (curr >= 0) {
				if (b - a > maxLen) {
					maxLen = b - a;
					res = new int[] { a, b };
				}
				b++;
			} else {
				a++;
			}
		}
		return res;
	}
 
	static void factor(int n) {
		if (si[n] == n) {
			f.add(n);
			return;
		}
		f.add(si[n]);
		factor(n / si[n]);
	}
 
	static void seive() {
		si = new int[1000001];
		primes = new ArrayList<>();
		int N = 1000001;
		si[1] = 1;
		for (int i = 2; i < N; i++) {
			if (si[i] == 0) {
				si[i] = i;
				primes.add(i);
			}
			for (int j = 0; j < primes.size() && primes.get(j) <= si[i] && (i * primes.get(j)) < N; j++)
				si[primes.get(j) * i] = primes.get(j);
 
		}
	}
	static long gcd(long a, long b) {
 
		if (b == 0) {
			return a;
		}
		return gcd(b, a % b);
	}
 
	static class unionfind {
		int[] p;
		int[] size;
 
		unionfind(int n) {
			p = new int[n];
			size = new int[n];
 
			for (int i = 0; i < n; i++) {
				p[i] = i;
			}
			Arrays.fill(size, 1);
		}
 
		int findSet(int v) {
			if (v == p[v])
				return v;
			return p[v] = findSet(p[v]);
		}
 
		boolean sameSet(int a, int b) {
			a = findSet(a);
			b = findSet(b);
			if (a == b)
				return true;
			return false;
		}
 
		int max() {
			int max = 0;
			for (int i = 0; i < size.length; i++)
				if (size[i] > max)
					max = size[i];
			return max;
		}
 
		void combine(int a, int b) {
			a = findSet(a);
			b = findSet(b);
			if (a == b)
				return;
			if (size[a] > size[b]) {
				p[b] = a;
				size[a] += size[b];
 
			} else {
				p[a] = b;
				size[b] += size[a];
			}
		}
	}
 
	static class Scanner {
		StringTokenizer st;
		BufferedReader br;
 
		public Scanner(InputStream system) {
			br = new BufferedReader(new InputStreamReader(system));
		}
 
		public Scanner(String file) throws Exception {
			br = new BufferedReader(new FileReader(file));
		}
 
		public String next() throws IOException {
			while (st == null || !st.hasMoreTokens())
				st = new StringTokenizer(br.readLine());
			return st.nextToken();
		}
 
		public String nextLine() throws IOException {
			return br.readLine();
		}
 
		public int nextInt() throws IOException {
			return Integer.parseInt(next());
		}
 
		public double nextDouble() throws IOException {
			return Double.parseDouble(next());
		}
 
		public char nextChar() throws IOException {
			return next().charAt(0);
		}
 
		public Long nextLong() throws IOException {
			return Long.parseLong(next());
		}
 
		public boolean ready() throws IOException {
			return br.ready();
		}
 
		public void waitForInput() throws InterruptedException {
			Thread.sleep(3000);
		}
	}
}