#include<stdio.h>
int totalcoast(int qx, int px,int qy,int py,int qz, int pz) {
    return(qx*px+qy*py+qz*pz);
}
 int main() {
     int qx,px,qy,py,qz,pz;
     scanf("%d %d",&qx,&px);
     scanf("%d %d",&qy,&py);
     scanf("%d %d",&qz,&qy);
     int total = total cost(qx,px,qy,py,qz,pz);
     printf("%d",total);
     return 0;
 }