import std.stdio, std.string, std.conv;
import std.range, std.algorithm;

void main() {
    int n;
    scan(n);

    int[] coin = new int[](10^^4 + 1);
    coin[1] = 1;
    foreach (i ; 2 .. 10^^4 + 1) {
        coin[i] = coin[i-1] + i;
    }

    int ans;

    while (n) {
        auto b = coin.assumeSorted.lowerBound(n + 1);
        n -= b.back;
        ans++;
    }

    writeln(ans);
}



void scan(T...)(ref T args) {
    string[] line = readln.split;
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}


void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}