#include<iostream>
using namespace std ;
int main(){
    int l ,t,b;
    float r;
    cin>>l;
    cin>>r;
    cin>>t;
    if((l>=0 &&r>=0&&t>=0){
        b =(l*t*r);
        cout<<b;
    }
    else{
        cout<<"Invalid input";
    }
    
}