import re

a, b = input().split()
pattern = re.compile(r'^-?\d0{2,}$')

A, B = int(a), int(b)

if pattern.match(a) and pattern.match(b):
    print(A * B // 10)
elif -99999999 <= A * B <= 99999999:
    print(A * B)
else:
    print('E')