//CF_TR5_A_v15
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <stdio.h>
#include <fstream>
#include <cmath>

using namespace std;

int main()
{
    //FILE *fff;
    long double x, y;
    /*ifstream file_in("angle1.txt");
    file_in >> x >> y;
    file_in.close();*/
    freopen("angle1.txt", "rt", stdin);
    scanf("%d%d", &x, &y);
    fclose(stdin);

    long double ang = 0;
    ang = atan2(y, x);

    //ofstream file_out("angle2.txt");
    ////file_out << ang;
    //fprintf(file_out, "%d", ang);
    //file_out.close();

    freopen("angle2.txt", "wt", stdout);
    printf("%d", ang);
    fclose(stdout);

    //system("pause");
    return 0;
}