#include<bits/stdc++.h> using namespace std; int main() { int a[1001],b[1001],n; long long sum=0; for(int i =1;I<=n){ cin>>a[i]; } for(int i =1;I<=n){ cin>>b[i]; } for(int i =1;I<=n){ sum+=a[i]*b[i]; } return 0; cout<<sum; }