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#include <iostream>
using namespace std;
int main()
{
	int a, b, n, a1, a2;
	cin >> n;
	a = 1;
	a1 = 0;
	
	for (int i = 0; i < n; i++)
	{
		a2 = a1 + a;
		a = a1;
		a1 = a2;
	}
	cout << a2;
}
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