This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
void solve(){
int n,m;
cin>>n>>m;
for(int i=0;i<n;i++){
int x,y;
cin>>x>>y;
}
cout<<n/2-1<<endl;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t=1;
// cin>>t;
while(t--){
solve();
}
return 0;
}
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