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- #include <bits/stdc++.h>
- using namespace std;
- int n;
- int rec(int i, int j){
- if (i == n) return 1;
- return rec(i + 1, j + 1) + rec(i + 1, j);
- }
- int main(){
- cin >> n;
- cout << rec(1, 1);
- }
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