#include<fstream.h>
ifstream f("stergeri.in");
ofstream g("stergeri.out");
long a[9000001];
long n,i,k;
int m;
int main()
{int x,y;
f>>n>>m>>k;
for(i=1;i<=n;i++)
	a[i]=i;
for(int u=1;u<=m;u++)
	{f>>x>>y;
	 int j=x;
	 i=x;
	 while(j<=y)
	   {if(a[i])
	      {a[i]=0;j++;}
	   i++;
	   }
	}
int p=0,ga=0;
for(i=1;i<=n&&!ga;i++)
	{if(a[i])
			p++;
	if(p==k)
		ga=1;
	}
g<<a[i-1];
return 0;
}