# !/ur/bin/python3

"""
https://www.interviewbit.com/problems/triplets-with-sum-between-given-range/
Triplets with Sum between given range
"""


def solve(A):
    
if __name__ == "__main__":
    A = [(lambda x: float(x))(x) for x in input().split(" ")]
    #s = int(input())
    print(solve(A))
