use std::io;

#[allow(unused_variables)]
fn main() {
    let v = input_nums();
    let (x, y, z) = (v[0], v[1], v[2]);
    let mut count = z;

    if x <= z {
        count -= 1;
    }
    if y <= z {
        count -= 1;
    }
    if z >= 4_380_000 {
        let s = "一万年と二千年前から素振りしてる";
    }

    println!("{}", count);
}

fn input_nums() -> Vec<u64> {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    let mut v = Vec::new();
    for n in s.split_whitespace() {
        v.push(n.parse().unwrap());
    }
    v
}