set

#include<bits/stdc++.h>
using namespace std;
typedef pair<double,double> pdd;
set<pdd> m;//存斜率k和截距b
const int N=30;
pdd point[N*N];
#define x first
#define y second
int main(){
int cnt=0;
for(int i=0;i<20;i++){
for(int j=0;j<21;j++){
point[cnt].x=i;
point[cnt].y=j;
cnt++;
}
}
int ans=20+21;
for(int i=0;i<cnt;i++){
for(int j=0;j<cnt;j++){
if(point[i].x==point[j].x||point[i].y==point[j].y)
continue;
double k=(point[j].y-point[i].y)/(point[j].x-point[i].x);
double b=(point[j].x*point[i].y-point[j].y*point[i].x)/(point[j].x-point[i].x);
m.insert({k,b});
}
}
for(auto it=m.begin();it!=m.end();it++)
ans++;
cout<<ans<<endl;
}
//40257