#include<bits/stdc++.h>
using namespace std;
#define debug(x) cout<<#x<<':'<<x<<endl;
typedef long long ll;
typedef pair<ll,ll> pii;
typedef long double ld;

ld dis(ld x1 ,ld y1,ld x2,ld y2){
    ld y=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
    return sqrt(y);
}
const ld eps=1e-9;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    ld x,y,l;
    cin>>x>>y>>l;

    cout<<fixed<<setprecision(7);

    ld d=dis(0,0,x,y);
    if(l==d){
        cout<<2<<endl;
        cout<<0<<' '<<0<<endl;
        cout<<x<<' '<<y<<endl;
    }
    else if(l<=x+y){
        
        ld tl=0,tr=x;
        while(tl+eps<tr){

            ld mid=(tl+tr)/2;
            if(dis(0,0,mid,y)+(x-mid)<l){
                tr=mid;
            }
            else {
                tl=mid;
            }
        }

        cout<<3<<endl;
        cout<<0<<' '<<0<<endl;
        cout<<tl<<' '<<y<<endl;
        cout<<x<<' '<<y<<endl;


        // cout<<dis(0,0,tl,y)+(x-tl)<<endl;

    }
    else{
        ld f=5e-5;
        ld q=(l)-(x+y);
        q/=2;
        int r=q/x;
        ld g=q-r*x;
        vector<pair<ld,ld>>vc;
        vc.push_back({0,0});
        
        

        for(int i=0;i<r;i++){
            auto it=vc.back();
            ld tx=it.first,ty=it.second;
            vc.push_back({0,it.second+f});
            vc.push_back({x,it.second+f});
            vc.push_back({x,it.second+f+f});
            vc.push_back({0,it.second+f+f});
        }

        if(g>0){
            auto it=vc.back();
            ld tx=it.first,ty=it.second;
            vc.push_back({0,it.second+f});
            vc.push_back({g,it.second+f});
            vc.push_back({g,it.second+f+f});
            vc.push_back({0,it.second+f+f});
        }
        vc.push_back({0,y});
        vc.push_back({x,y});
        cout<<vc.size()<<endl;

        ld check=0;
        for(int i=0;i<vc.size();i++){
            cout<<vc[i].first<<' '<<vc[i].second<<endl;
            if(i==0) continue;
            else {
                check+=dis(vc[i-1].first,vc[i-1].second,vc[i].first,vc[i].second);
            }
        }
        // if(fabs(check-l)<eps){
        //     cout<<'#'<<endl;
        // }
        // else {
        //     cout<<'%'<<endl;
        // }
    }
    

}