Let p (i) be the i-th prime number from the smallest. For example, 7 is the fourth prime number from the smallest, 2, 3, 5, 7, so p (4) = 7.

Given n, the sum of p (i) from i = 1 to n s

s = p (1) + p (2) + .... + p (n)

Create a program that outputs. For example, when n = 9, s = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 = 100.



Input

Given multiple datasets. Each dataset is given the integer n (n ≤ 10000). When n is 0, it is the last input. The number of datasets does not exceed 50.

Output

For n in each dataset, print s on one line.

Example

Input

2
9
0


Output

5
100
import java.util.Scanner;

public class Main {

	static boolean[] primes;

	static void primeSet(final int MAX){
		primes = new boolean[MAX+1];

		primes[2] = true;
		for(int i=3;i<=MAX;i+=2){
			primes[i] = true;
		}
		int rt = (int) Math.sqrt(MAX);
		for(int i=3;i<=rt;i+=2){
			if(primes[i]){
				for(int j=i*2;j<=MAX;j+=i){
					primes[j] = false;
				}
			}
		}
	}

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);

		primeSet(110000);

		while(true){
			int n = stdIn.nextInt();
			int sum = 0;
			int cnt = 0;
			
			if(n==0){
				return;
			}
			
			for(int i=2;;i++){
				if(primes[i]){
					cnt++;
					sum+=i;
				}
				if(cnt==n){
					break;
				}
			}
			System.out.println(sum);
		}	
	}
}