#include <stdio.h>
#define TH 99999999

char ispow10under8(long k){
        int a = 100;
        while(a <= 100000000){
                for(int n = 1; n <= 9; n++){
                        if( n*a == k || -n*a == k) return 1;
                }
                a *= 10;
        }
        return 0;
}
int main(){
        long long A,B;
        scanf("%lld %lld",&A,&B);
        if(ispow10under8(A) && ispow10under8(B)){
                printf("%lld\n",(A*B)/10);
        }else{
                if(-TH <= A*B && A*B <= TH) printf("%lld\n",A*B);
                else puts("E");
        }
}