#coding:utf-8

def main():
    a,b = map(int,input().split(' '))
    if a * b <= -100000000 or a * b >= 100000000:
        print('E') 
    elif a % 10 == 0 and b % 10 == 0:
        print(a * b // 10)
    else:
        print(a * b)

if __name__ == '__main__':
    main()