#include <stdio.h>
int main(){
    int qtyX,priceX;
    int qtyY,priceY;
    int qtyZ,priceZ;
    long totalCost;
    
    if (scanf("%d %d", &qtyX ,&priceX) ! = 2){
        printf("Invalid input");
        return 0;
    }
    
    if (scanf("%d %d", &qtyY, &priceY) ! = 2){
        printf("Invalid input");
        return 0;
    }
    if (scanf("%d %d", &qtyZ, &priceZ) ! = 2){
        printf("Invalid input");
        return 0;
    }
    totalCost =(qtyX*priceX)+(qtyY *priceY)+(qtyZ * priceZ);
         
        printf("%d,totalCost");
        
        return 0;
          
}