#include<iostream> using namespace std; int main(){ int n = 0,sum = 0; cin>>n; int a[1000] = {}; int b[1000] = {}; for(int i=0;i<n;i++){ cin>>a[i]; } for(int i=0;i<n;i++){ cin>>b[i]; } for(int i=0;i<n;i++){ sum += a[i] * b[i]; } cout<<sum; }