#include<iostream> using namespace std; int main(){ int n,s=0,i,j; cin>>n; int a[101],b[101]; for(i=0;i<n;i+=1){ cin>>a[i]; } for(i=0;i<n;i+=1){ cin>>b[i]; } for(i=0;i<n;i+=1) s+=a[i]*b[i]; cout<<s; return 0; }