# SQ0.py  computes a square root of a nonnegative int.
# input: a nonnegative int
# output: a nonnegative square root

import math   # this gets a prewritten program (''module''), math

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

assert num >= 0  # num _must_ be nonnegative or we don't proceed!

answer = math.sqrt(num)
print answer

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