#coding:utf-8

def main():
    l,m = map(int,input().split(' '))
    print(cul(l,m))

def cul(a,b):
    ans = a * b
    _a = a/100
    _b = b/100
    if a%100==0 and -9<=_a<=9 and b%100==0 and -9<=_b<=9:
        ans //= 10
        return ans    
    elif ans <= -100000000 or ans >= 100000000:
        return 'E'
    else:
        return ans

if __name__ == '__main__':
    main()