#include <iostream>
#define N 10010
#define ROW 2
using namespace std;
int main()
{
int num[N];
int count[N];
double value[N],sum=0.0,ave=0.0;
for(int i=0;i<ROW;i++)
{
cin >> num[i]>>count[i]>>value[i];
sum += count[i] * value[i];
}
printf("VALOR A PAGAR: R$ %.2lf",sum);
return 0;
}