#include<stdio.h>
  int totalcost ( int quantity X ,price X
    int quantity Y ,price Y
    int quantity Z ,price Z)
    {
    return(quantity X*price X)+
    (quantity Y*price Y)+
    (quantity Z*price Z;);
    }
{
        int main();
        int quantity X ,price X;
        int quantity Y ,price Y;
        int quantity Z ,price z;
        
        
    scanf("%d %d",&quantity X ,price X);
    scanf("%d %d",&quantity Y ,price Y);
    scanf("%d %d",&quantity Z ,price Z);
    
    if(quantity X<0||price X<0||
    quantity Y<0||price Y<0||
    quantity Z<0||price Z)
    {
    printf(Invalid input);
    }
    int total,totalcost:
    int total + totalcost(quantity X<0||price X<0||
    quantity Y<0||price Y<0||
    quantity Z<0||price Z);
    return 0;
    
}