1 #include<iostream>
2 #include<vector>
3 #include<set>
4 using namespace std;
5 typedef pair<int,int> PII;
6 typedef pair<PII,int> PIII;
7 vector<PII> v;
8 set<PIII> s;
9 int x,y;
10 int gcd(int a,int b){
11 if(b==0) return a;
12 return gcd(b,a%b);
13 }
14 int main(){
15 cin>>x>>y;
16
17 for(int i=0;i<x;i++){
18 for(int j=0;j<y;j++){
19 v.push_back({i,j});
20 }
21 }
22
23 for(int i=0;i<v.size();i++){
24 for(int j=i+1;j<v.size();j++){
25 int x1=v[i].first;
26 int y1=v[i].second;
27 int x2=v[j].first;
28 int y2=v[j].second;
29 int A=y1-y2,B=x2-x1,C=x1*y2-x2*y1;
30 int gcdd=gcd(gcd(A,B),C);
31 s.insert({{B/gcdd,A/gcdd},C/gcdd});
32 }
33 }
34
35 cout<<s.size();
36 return 0;
37 //答案40257
38 }
