#include<iostream> 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; }