#include<stdio.h>
int main(){
    int qx, px, qy, qz, pz;
    long long total;
    if (scanf("%d %d", &qx, &px) != 2 ||
        scanf("%d %d", &qy, &py) != 2 ||
        scanf("%d %d", &qz, &pz) != 2) {
            printf("Invalid Input");
            return 0;
        } 
        if (qx < 0 || px < 0 || qy < 0 || qz < 0 || pz < 0){
            printf("Invalid Input");
        }else{
            total = (long long)qx * px + (long long)qy * py + (long long)qz * pz;
            printf 
        }
}