import sys
input = sys.stdin.readline

a, b = map(int, input().split())
ans = 0

if a == 10 or b == 10:
    ans = round(a*b/10)

elif a % 10 == b % 10 == 0:
    ans = round(a*b/10)

else:
    ans = round(a*b)
    if abs(ans) > 99999999.9:
        ans = "E"

print(ans)