#!python
# -*- coding: utf-8 -*-


def is_anzan(a, b):
    a = abs(a)
    b = abs(b)
    if a < 100 or b < 100:
        return False
    return int(str(a)[1:]) == 0 and int(str(b)[1:]) == 0


def main():
    A, B = map(int, input().split())
    if is_anzan(A, B):
        print(A * B // 10)
    else:
        if -99999999 <= A * B <= 99999999:
            print(A * B)
        else:
            print('E')


if __name__ == '__main__':
    main()