#!/usr/bin/python
#-*- coding: utf-8 -*-
def eGFR():
	print "Kalkulator eGFR tylko dla osób powyżej 18 r.ż"
	krea = int(raw_input("Kreatynina: "))
	a = int(raw_input("Wiek: "))
	while a < 18:
		a = int(raw_input("Wiek(>18r.ż): "))
	r = raw_input("Afroamerykanin(T/N): ")
	while r not in ("T", "t", "N", "n"):
		r = raw_input("Afroamerykanin(T/N): ")
	s = raw_input("Płeć(M/F): ")
	while s not in ("M", "m", "F", "f"):
		s = raw_input("Płeć(M/F): ")
	EGFR = 186.3 * (krea ** -1.154) * (a ** -0.203)
	if r == "T" or r == "t":
		EGFR = EGFR * 1.212
	if s == "f" or s == "F":
		EGFR = EGFR * 0.742
	if r == "T" or r == "t" and s == "f" or s == "F":
		EGFR = EGFR * 1.212 * 0.742
	return EGFR
print eGFR()