import numpy as np
b = int(input()) 
n = int(input(), b)
digit = 0
total = 0
while True:
    total = total * b + (b - 1)
    digit += 1
    if n <= total * digit:
        break
    n -= total * digit
num = b ** (digit - 1) + ((n + digit - 1) // digit) - 1
print(np.base_repr(num, b)[(n - 1) % digit])