import std;

int catalan(int n) {
    assert(n <= 16); // check overflow

    int ret = 1;
    for (int i = 2; i <= n; i++) {
        ret = ret * 2 * (2 * (i - 1) + 1) / (i + 1);
    }
    return ret;
}

void main() {
    int n; scan(n);
    writeln(catalan(n));
}

void scan(T...)(ref T a) {
    string[] ss = readln.split;
    foreach (i, t; T) a[i] = ss[i].to!t;
}
T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;