#include<fstream>

using namespace std;
int a[10000001], i, j, k, m, n,x,y,contor;

ifstream cin("stergeri.in");
ofstream cout("stergeri.out");
int main()
{
    cin>>n>>m>>k;
    for(i=1;i<=m;i++)
      { cin>>x>>y;
          for(j=x;j<=y;j++)
               a[j]=1;
               }          
    for(i=n;i>=1,contor>=k ;i--)
        if(a[i]!=1) contor++;
    cout<<i;
    return 0;
}