use proconio::input;

fn main() {
	input! {
		n: usize,
	}

    let ans = if n % 2 == 0 {
        let count = n / 2;

        "1".repeat(count)
    } else {
        let count = (n - 3) / 2;
        format!("7{}", "1".repeat(count))
    };
    
    println!("{ans}");
}