[백준] 2875번 : 대회 or 인턴 - Python(파이썬)

https://www.acmicpc.net/problem/2875

n,m,k=map(int,input().split())
c=n//2
count=m if c>=m else c
re=n+m-3*count
n=n-2*count
m=m-count
k-=re

if k>0:
    a=k//3
    b=k%3

    if b==0: count-=a
    else: count-=a+1
print(count)