#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream cin ("stergeri.in");
ofstream cout ("stergeri.out");
vector<int>v;
int main()
{
    int n,m,k,x,y;
    cin>>n>>m>>k;
    v.push_back(0);
    for(int i=1;i<=n;++i)
        v.push_back(i);
    for(int i =1;i<=m;++i)
    {
        cin>>x>>y;
        v.erase(v.begin()+x,v.begin()+y+1);
    }
    cout<<v[k]<<endl;
    return 0;
}