# include<iostream> using namespace std; int main(){ int a[1000] = {0} , b[1000] = {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 sum= 0; for(int i=1;i<=n;i++){ sum+= a[i] * b[i]; } cout<<sum; return 0; }