#include <iostream> using namespace std; int main() { int N,count = 0; cin >> N; int arr[666],brr[666]; for (int i = 0; i < N; i++) { cin >> arr[i]; } for(int i=0;i<N;i++){ cin>>brr[i]; } for (int i = 0; i < N; i++) { count=count+arr[i]*brr[i]; } cout << count << endl; return 0; }