#include<iostream> #include<iomanip> using namespace std; int main() { int n; cin>>n; int a[1001],b[1001]; 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; }