#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() 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; }