16 lines
315 B
C++
16 lines
315 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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const int N = 30;
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LL f[N];
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int main() {
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int n;
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cin >> n;
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f[0] = 1;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= i; j++)
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f[i] += f[j - 1] * f[i - j];
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cout << f[n] << endl;
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return 0;
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}
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