// editor3
#include <stdio.h>

typedef struct rect{
    float length, witdh;
}vick;

int main(){
    float num1,num2;
    scanf("%f",&num1,num2);
    if(num1<0 ||num2<0){
        printf("Invalid input");
        return 0;
    }
    
    printf("%f"num1*num2);
    
    
    
}