#include<stdio.h>
typedef struct area{
    float l;
    float b;
}rectangle;
int main(){
    int length,breadth;
    scanf("%f",&length);
    scanf("%f",&breadth);
    if(length<0 || breadth<0){
        printf("Invalid input");
        return 0;
    }
    area=length*breadth;
    printf("%.2f",area);
    return 0;
}