mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = input().rstrip('\n')
    if N[0] == "-":
        print(0)
    else:
        if len(N) <= 2:
            print(0)
        else:
            print(N[:-2])


if __name__ == '__main__':
    main()