#include<iostream> #include<iomanip> 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; }