#include "bits/stdc++.h"
using namespace std;
const int N = 105;
using db = long double;

int n, m;
db len;
using pdb = pair<db, db>;
vector<pdb> ans;
const db eps = 1e-9;
int dcmp(const db &x) {
    return abs(x) < 1e-5?0:(x < 0?-1:1);
}
db x = 0, y = 0, lx = 0, ly = 0;
db dist(db x,db y, db _x,db _y) {
    return sqrtl((x-_x)*(x-_x)+(y-_y)*(y-_y));
}
void add(db x, db y) {
    ::x = x, ::y = y;
    ans.push_back({x, y});
    len -= dist(::x, ::y, lx, ly);
    lx = x, ly = y;
}


void solve()
{
    add(x, y);
    int f = 0;
    while (len > 1e-9)
    {
        if (f == 0) {
            if (dcmp(n + m - x - len) != -1) {
                db mx = (x + m) / 2, my = (y + n) / 2;
                db d = dist(mx, my, m, 0);
                db vx = -(m - mx) / d, vy = my / d;
                db l = 0, r = d;
                db nx, ny;
                while((r - l)>eps) {
                    db mid = (l + r) / 2;
                    nx = m + vx * mid, ny = vy * mid;
                    if (dist(nx, ny, x, y) + dist(nx, ny, m, n) > len) {
                        l = mid;
                    }
                    else r = mid;
                }
                add(nx, ny);
                break;
            }
            else {
                y = n;
                add(x, y);
            }
        } else {
            if (dcmp(sqrt(1+n*n)+dist(x+1,0,m,n) - len) != -1) {
                db mx = x + 1, my = y;
                db vx = 0, vy = -1;
                db l = 0, r = n;
                db nx, ny;
                while((r - l)>eps) {
                    db mid = (l + r) / 2;
                    nx = mx + vx * mid, ny = my + vy * mid;
                    if (dist(nx, ny, x, y) + dist(nx, ny, m, n) < len) {
                        l = mid;
                    }
                    else r = mid;
                }
                add(nx, ny);
                break;
            }
            else {
                x++, y=0;
                add(x, y);
            }
        }
        f ^= 1;
    }
    add(m, n);

}

int main()
{
    cout << fixed << setprecision(10);
    cin >> n >> m >> len;
    solve();
    cout << ans.size() << "\n";
    for (auto [px, py] : ans)
    {
        cout << px << " " << py << "\n";
    }
    cout.flush();
    // assert(dcmp(len) == 0);
//    cerr << len << endl;
    return 0;
}