#include<iostream> #include<cstring> using namespace std; int main() { int a[100] = {0}, b[100] = {0}; int n; cin >> n; for (int i = 1; i <= n; i++) { cin >> a[i]; } for (int i = 1; i <= n; i++) { cin >> b[i]; } int s = 0; for (int i = 1; i <= n; i++) { s += a[i] * b[i]; } cout << s; }