#include <iostream>
using namespace std;
int main() {
// Fabioni
int n;
cin >> n;
int aduna1 = 1, aduna2 = 0;
int incercari = 1;
int sir = 0;
int iesire;
while (sir <= n) {
if (n == 1) {
incercari = 0;
} else {
sir = aduna1 + aduna2;
aduna1 = aduna2;
aduna2 = sir;
incercari++;
cout << sir;
}
}
cout << sir;
return 0;
}
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