def c2f(C):
    return 1.8*C + 32

def f2c(F):
    return (F - 32)/1.8

def c2k(C):
    return C + 273.15

def k2c(K):
    return K - 273.15

def f2k(F):
    return (F - 32)/1.8 + 273.15

def k2f(K):
    return 1.8*(K - 273.15) + 32