# include<stdio.h>   # 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;  }