# SQ.py  computes a square root of a nonnegative int.
# input: a nonnegative int
# output: a nonnegative square root

import math

num = int(raw_input("Type an int: "))

if (num >= 0) :
    # we do these commands when the question has answer, True:
    answer = math.sqrt(num)
    print answer

print  # a blank line
raw_input("press Enter to finish")