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