#include <stdio.h> int main() { int s; double money; scanf("%d", &s); if (s <= 2) { money = 6; } else if (s <= 10) { money = 6 + (s - 2) * 1.8; } else { money = 6 + 8 * 1.8 + (s - 10) * 1.8 * 1.5; } printf("%lf", money); return 0; }