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#include <bits/stdc++.h>
using namespace std;
//著名的斐波纳契数列
int Fibonacci(int n) {
if (n == 0) return 0;
if (n == 1) return 1;
return Fibonacci(n - 1) + Fibonacci(n - 2);
}
int main() {
int n;
cin >> n;
cout << Fibonacci(n) << endl;
return 0;
}