#include<iostream>
using namespace std;
void main() {
	int n,total=0;
	cin >> n;
	int *vecto1 = new int[n], *vecto2 = new int[n];
	cout << "nhap vec to 1=";
	for (int i = 0; i < n; i++) {
		cin >> vecto1[i];
	}
	cout << "nhap vec to 2=";
	for (int i = 0; i < n; i++) {
		cin >> vecto2[i];
	}
	for (int i = 0; i < n; i++) {
		total += vecto1[i] * vecto2[i];
	}
	cout << total;
}