백준 2875 자바 - 대회 or 인턴

// 대회 or 인턴
package Bronze_III_3;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Ex2875 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        int n = Integer.parseInt(st.nextToken());
        int m = Integer.parseInt(st.nextToken());
        int k = Integer.parseInt(st.nextToken());

        int cnt = 0;

        while (n >= 2 && m >= 1
                && m + n >= 3 + k) {
            n -= 2;
            m--;
            cnt++;
        }

        System.out.println(cnt);
    }
}