#include <fstream.h>
#include <string.h>

int main()

{unsigned long n,m,k,i,nr,j,x,y,a[200];

 ifstream fin("stergeri.in");
 ofstream fout("stergeri.out");

 fin>>n>>m>>k;

 memset(a,0,sizeof(a));

 for (i=1; i<=m; i++)
	{
	 fin>>x>>y;
	 nr=0; j=x;
	 while (nr!=(y-x+1))
		{
		 if (a[j]==0)
			{
			 a[j]=1;
			 nr++;
			}
		 j++;
		}
	}

 nr=0; j=1;
 while (nr!=k)
	{
	 if (a[j]==0)
		nr++;
	 j++;
	}

 fout<<j-1;
 return 0;
}