"""
출처:프로그래머스,
https://school.programmers.co.kr/learn/courses/30/lessons/181187
"""
# 풀이 과정
def solution(r1, r2):
    count = 0
    for x in range(1, r2 + 1):
        a = (r2 ** 2 - x ** 2) ** 0.5
        b = 0 if x > r1 else (r1 ** 2 - x ** 2) ** 0.5
        if a - b <= 1:
            if int(a) == a and int(b) != b:
                count += 1
            elif int(a) != a and int(b) == b:
                count += 1
            elif int(a) == 0 and int(b) == 0:
                count += 1
            else:
                count += int(a) - int(b)
        elif a - b >= 1 and int(a) == a and int(b) == b:
            count += int(a) - int(b) + 1
        elif a - b >= 1 and int(b) == b:
            count += int(a) - int(b) + 1
        elif a - b >= 1 and int(a) == a:
            count += int(a) - int(b)
        else:
            count += int(a) - int(b)

    return count * 4