C++ :

#include<bits/stdc++.h>
using namespace std;
int a,b,c;
string aa,bb,cc;
int main()
{
//  freopen("2.in","r",stdin);  
//  freopen("2.out","w",stdout);
    cin>>a>>b>>c;
    if(a!=0)
    for(int i=0;i<=a;i++)
        aa+='0';
    if(c!=0)
    for(int i=0;i<=c;i++)
        cc+='1';
    if(b!=0)
    for(int i=1;i<=b+1;i++)
	   	if(i%2==1) bb+='0';
	    else bb+='1';
//	cout<<aa<<" "<<bb<<" "<<cc<<endl;
	int as=aa.size(),bs=bb.size(),cs=cc.size();  
	if(aa[as-1]=='0' && b!=0) aa.erase(as-1,1);
	if(bb[bs-1]=='0' && c!=0) bb.erase(bs-1,1),cc+='0';
	bs=bb.size();
	if(bb[bs-1]=='1' && c!=0) bb.erase(bs-1,1);	
//	cout<<aa<<" "<<bb<<" "<<cc<<endl;
	cout<<aa<<bb<<cc;
    return 0;
}