#include <iostream>
#include <cmath>
using namespace std;

float otvet(int h, int m)
{
    float x = (m / 60.0f) * 360.0f;
    float hh = (h / 12.0f) * 360.0f;
    float add = (m/60.0f)*1/12.0f*360.0f;

    return fabs(hh + add - x);
}

int main() {
	cout << otvet(3, 15) << endl;
	return 0;
}