#include<stdio.h>
typedef struct stud{
    float length;
    float width;
}vick;
int main(){
    float length,width;
    int ind,size=1;
    if(length<0||width<0){
        printf("Invalid input");
        return 0;
    }
    vick stud[size]{
        for(ind=0;ind<size;ind++){
            scanf("%d",&stud[ind].length);
            scanf("%d,"&stud[ind].width);
        }
        printf("%d",stud[ind].length*stud[ind].width);
        return 0;
    }
}