#include <stdio.h>

int main() {
    long a,b;
    scanf("%ld %ld", &a, &b);

    if ((a%10==0)&&(b%10==0)) {
        printf("%d\n",a/10*b);
        return 0;
    }
    else {
        long ans=a*b;
        if ((ans<-99999999)||(ans>99999999)) {
            printf("E\n");
            return 0;
        }
        printf("%d\n",a/10*b);
        return 0;
    }
}