9

#include <iostream>
#include <cmath>
using namespace std;
int main()

{
	
	int x, y;
	cin >> x;
	if (x == 0 || cos(x) == 0){
	    cout << "нет решения";	
	}
	else{
		y = (log(abs(cos(x)))) / (log(1 + x*x));
		cout << y;
	}

	return 0;
}