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

ld dis(ld x1 ,ld y1,ld x2,ld y2){
    ld y=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
    return sqrt(y);
}
ld dis2(pii a,pii b){
    return dis(a.first,a.second,b.first,b.second);
}
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;
        return 0;
    }
    


    bool flag=false;
    if(x<y) {
        flag=true;
        swap(x,y);
    }
    vector<pii>vc;
    vc.push_back({0,0});



    auto it =vc.back();
    ld lc=l;
    //ld yy=y;

    if(l>x+y){
        while(true){
            vc.push_back({x-vc.back().first,vc.back().second});
            lc-=x;
            if(dis2(vc.back(),{0,y})+x>=lc){
                // debug(dis2(vc.back(),{0,y})+x);
                // debug(lc);
                break;
            }
            vc.push_back({vc.back().first,vc.back().second+1});
            lc--;
        }
    }

   //if(fabs(vc.back().first)<eps){
   

    ld tl=0,tr=x;
    while(tl+eps<tr){
        ld mid=(tl+tr)/2;
        if(dis(vc.back().first,vc.back().second,mid,y)+(x-mid)<lc){
            tr=mid;
        }
        else {
            tl=mid;
        }
    }

        vc.push_back({tl,y});
        vc.push_back({x,y});
    
        cout<<vc.size()<<endl;

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

}