'''
    Python3(PyPy3) Template for Programming-Contest.

    author : sgsw

    generated : 2021/08/13   
    when : 21:42:33

'''

import sys


def input():
    return sys.stdin.readline().rstrip()


DXY = [(0, -1), (1, 0), (0, 1), (-1, 0)]  # LDRU
mod = 998244353
inf = 1 << 64


def main():
    n = input()
    while len(n) < 3:
        n = "0" + n 
    print(n)
    return 0


if __name__ == "__main__":
    main()