#include<bits/stdc++.h>
using namespace std;
int main(){
int num1,sum1;
double price1;
int num2,sum2;
double price2;
cin>>num1>>sum1>>price1;
cin>>num2>>sum2>>price2;
printf("VALOR A PAGAR: R$ %.2f",sum1*price1+sum2*price2);
return 0;
}