#include <bits/stdc++.h>
using namespace std;
int Fibonacci(int n)
{
if ( n == 0 )
return 0;
else if ( n == 1 )
return 1;
else
return ( Fibonacci(n-1) + Fibonacci(n-2) );
}
int main() {
// your code goes here
int n;
scanf("%d",&n);
printf("%d",Fibonacci(n));
return 0;
}
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