You are given two rectangles on a plane. The centers of both rectangles are located in the origin of coordinates (meaning the center of the rectangle's symmetry). The first rectangle's sides are parallel to the coordinate axes: the length of the side that is parallel to the *Ox* axis, equals *w*, the length of the side that is parallel to the *Oy* axis, equals *h*. The second rectangle can be obtained by rotating the first rectangle relative to the origin of coordinates by angle α.

Your task is to find the area of the region which belongs to both given rectangles. This region is shaded in the picture.
The first line contains three integers *w*, *h*, α (1 ≤ *w*, *h* ≤ 10<sup class="upper-index">6</sup>; 0 ≤ α ≤ 180). Angle α is given in degrees.
import sys
from functools import lru_cache, cmp_to_key
from heapq import merge, heapify, heappop, heappush
from math import *
from collections import defaultdict as dd, deque, Counter as C
from itertools import combinations as comb, permutations as perm
from bisect import bisect_left as bl, bisect_right as br, bisect, insort
from time import perf_counter
from fractions import Fraction
import copy
from copy import deepcopy
import time
starttime = time.time()
mod = int(pow(10, 9) + 7)
mod2 = 998244353

def data(): return sys.stdin.readline().strip()
def out(*var, end="\n"): sys.stdout.write(' '.join(map(str, var))+end)
def L(): return list(sp())
def sl(): return list(ssp())
def sp(): return map(int, data().split())
def ssp(): return map(str, data().split())
def l1d(n, val=0): return [val for i in range(n)]
def l2d(n, m, val=0): return [l1d(n, val) for j in range(m)]
try:
    # sys.setrecursionlimit(int(pow(10,6)))
    sys.stdin = open("input.txt", "r")
    # sys.stdout = open("../output.txt", "w")
except:
    pass
def pmat(A):
    for ele in A: print(*ele,end="\n")

# from sys import stdin
# input = stdin.buffer.readline
# I = lambda : list(map(int,input().split()))

# import sys
# input=sys.stdin.readline
w,h,a=L()
if (a > 90): a = 180 - a
 
if (a == 0) :
    print(w * h)
elif (a == 90) :
    print(min(w, h) ** 2)
else :
    a = a * pi / 180.0
    if (w < h) : w, h = h, w
    corner_x = cos(a) * (w / 2.0) + sin(a) * (h / 2.0)
    if (corner_x >= w / 2 ) :
        x0 = w / 2.0 + (h / 2.0 - (h / 2.0) / cos(a)) * (cos(a) / sin(a))
        y0 = h / 2.0 - (tan(a) * (- w / 2.0) + (h / 2.0) / cos(a))
        x1 = w / 2.0 - (h / 2.0 - (w / 2.0) / sin(a)) * (-tan(a))
        y1 = h / 2.0 - ((-cos(a) / sin(a)) * (w / 2.0) + (w / 2.0) / sin(a))
 
        print(w * h - x1 * y1 - x0 * y0)
    else :
        y = tan(a) * (w / 2.0) - (h / 2.0) / cos(a) + h / 2.0
        y0 = y - h
        x0 = y * tan(pi / 2.0 - a)
        print(w * h - (y0 * tan(pi / 2.0 - a) + x0) * h)