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#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
int a0 = 0;
int a1 = 1;
int a2;
for (int i = 0; i < n - 1; i++)
{
a2 = a1 + a0;
a0 = a1;
a1 = a2;
}
cout << a1;
}
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