/*
TASK:number
LANG:C++
*/
#include<iostream>
using namespace std;
int main()
{
 int n,k,d,a[1024]={0};
 cin>>n>>k>>d;
 int s=2*k+1;
 if(k==1) {for(int i=0; i<n; i++) if(i%2==0) a[i]=1; else a[i]=0;for(int i=0; i<n; i++) cout<<a[i];}
 else
 {
 if(s<n)
 {
  cout<<"0";
 } 
 else
 {
  a[0]=1;
  a[k+1]=1;
  a[s-1]=1;
  for(int i=0; i<n; i++) cout<<a[i];
 }
 }
 cout<<endl;
 system("PAUSE");
 return 0;
}
