# include<iostream> using namespace std; int a[1001],b[1001]; int main(){ 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 sum=0; for (int i=1;i<=n;i++){ sum =sum+a[i]*b[i]; } cout <<sum; return 0; }