# No.722 100×100=1000
a, b = [int(s) for s in input().split()]

if a % 100 == 0 and b % 100 == 0 and len([s for s in str(a) if s != '0']) == 1 and len([s for s in str(b) if s != '0']) == 1:
    print(a * b // 10)
else:
    print(a * b if -99999999 <= a * b <= 99999999 else 'E')