//uva579 #include <cstdio> #include <iostream> using namespace std; int main() { int h, m; double ah, am, ans; // angle of hour and min while (scanf("%d:%d", &h, &m) && (h | m)) { if (h == 12) h = 0; ah = h * 30 + 30 * m * 1.0 / 60; am = m * 6; ans = ah - am; while (ans < 0) ans += 360; if (ans > 180) ans = 360 - ans; printf("%.3lf\n", ans); } return 0; }