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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define N int(1e6)
  4. using namespace std;
  5. ll n,ans=1;
  6. int main()
  7. {
  8.     ios::sync_with_stdio(0);
  9.     cin.tie(0);
  10.     cout.tie(0);
  11.  
  12.     cin>>n;
  13.     for(int i=(n-3);i<=n;i++) ans*=i;
  14.     ll ans1=1;
  15.     for(int i=1;i<=4;i++) ans1*=i;
  16.     cout<<ans/ans1;
  17.  
  18.  
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/VfPS7J
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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