#include<stdio.h>

struct Rectangle {
    float lenght;
    float width;
};

int main() {
    struct Rectangle r;
    float area;
    
    scanf("%f", &f.lenght);
    scanf("%f," &r .width);
    
    if(r.length < o || r.width < 0) {
        printf("Invalid input");
        return 0;
    }
    area = r.length * r.width;
    printf("%2.f", area);
    
    return o;
}