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- #include<iostream>
- using namespace std;
- int main(){
- int n,dem=1;
- cin>>n;
- for(int i=0;i<=n;i++){
- for(int j=0;j<=n;j++){
- if(i+j==n)
- dem++;
- }
- }
- dem=dem/2;
- cout<<dem;
- }
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