import sys
sys.setrecursionlimit(1 << 20)
INF = float('inf')


def read_int_list():
    return list(map(int, input().split()))


def read_floats():
    return map(float, input().split())


import math


def dist(x, y, cx, cy):
    return math.sqrt((x - cx)**2 + (y - cy)**2)


def main():
    X, Y, R = read_floats()
    ans = 2*


main()
