#include <iostream>
#include <cmath>

using namespace std;

typedef long long int Integer;

Integer squaredSolutions3(Integer x, Integer y[])
{
    Integer a = (100 - x)*(100 - x);
    Integer b = 100*(x*x - 104*x + 3600);
    Integer c = 10000*(x - 36)*(x - 36);
    Integer delta = b*b - a*c;

    if (delta < 0) {
        return 0;
    }

    Integer diff = sqrt(delta);

    if (diff*diff != delta) {
        return 0;
    }

    if (diff == 0) {
        y[0] = b/a;

        if (a*y[0] == b) {
            return 1;
        }

        return 0;
    }

    int k = 0;

    y[k] = (b - diff)/a;

    if (a*y[k] == b - diff) {
        ++k;
    }

    y[k] = (b + diff)/a;

    if (a*y[k] == b + diff) {
        ++k;
    }

    return k;
}

bool checkSquaredSolution2(Integer x, double y)
{
    double a = x*y*(x + y - 20);

    if (a < 0) {
        return false;
    }

    return a*(120*(x - 30) + x*y - 20*x + 100*y) >= 0;
}

Integer squaredSolutions2(Integer x, Integer y[])
{
    int n = squaredSolutions3(x, y);
    int k = 0;

    while (k < n) {
        if (checkSquaredSolution2(x, y[k])) {
            ++k;
        } else {
            for (Integer i = k + 1; i < n; ++i) {
                y[i - 1] = y[i];
            }

            --n;
        }
    }

    return n;
}

bool checkSquaredSolution(Integer x, double y)
{
    if (y < 0) {
        return false;
    }

    double a = x*(x + y - 20);

    if (a < 0) {
        return false;
    }

    return (a - 100*y)*(60 - x) >= 0;
}

Integer squaredSolutions(Integer x, Integer y[])
{
    int n = squaredSolutions2(x, y);
    int k = 0;

    while (k < n) {
        if (checkSquaredSolution(x, y[k])) {
            ++k;
        } else {
            for (Integer i = k + 1; i < n; ++i) {
                y[i - 1] = y[i];
            }

            --n;
        }
    }

    return n;
}

void checkSolution(Integer x, double y)
{
    if (x < 0 || y < 0 || x + y < 20) {
        return;
    }

    if ((sqrt(x) + sqrt(x + y - 20))*(10 + sqrt(y)) < 0) {
        return;
    }

    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
    cout << "z = " << x + y - 20 << endl;
    cout << endl;
}

void solve(Integer x)
{
    Integer y[2];
    Integer n = squaredSolutions(x, y);

    for (Integer i = 0; i < n; ++i) {
        checkSolution(x, y[i]);
    }
}

int main()
{
    for (int x = 0; x <= 99; ++x) {
        solve(x);
    }

    return 0;
}