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