Let's write all the positive integer numbers one after another from 1 without any delimiters (i.e. as a single string). It will be the infinite sequence starting with 123456789101112131415161718192021222324252627282930313233343536...

Your task is to print the k-th digit of this sequence.

Input

The first and only line contains integer k (1 ≤ k ≤ 10000) — the position to process (1-based index).

Output

Print the k-th digit of the resulting infinite sequence.

Examples

Input


7


Output


7


Input


21


Output


5
"""
lis=[]
n=int(input())
for i in range(n):
            l=[int(x) for x in input().split()]
            lis.append(l)
l=[]
for i in range(len(lis)):
            for j in range(len(lis[i])):
                        l.append(lis[i][j])
for i in range(n-1,0,-1):
            for j in range((i*(i-1))//2,(i*(i+1))//2,1):
                        l[j]+=max(l[j+i],l[j+i+1])
            
print(l[0])
"""
s=""
for i in range(1,10**4+1):
            s+=str(i)
print(s[int(input())-1])
