#include <fstream>
#include <vector>
using namespace std;
ifstream fin("stergeri.in");
ofstream fout("stergeri.out");

vector < pair < int, int> >v;
int n, m, k;
void Read()
{
    int i,x,y;
    v.push_back(make_pair(0,0));
    fin>>n>>m>>k;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y;
        v.push_back(make_pair(x,y));
    }
}
int Solve()
{
    int i;
    for(i=v.size()-1;i>=1;i--)
    {
        if(k>=v[i].first) k=k+v[i].second-v[i].first+1;
    }
    return k;
}
int main()
{
    Read();
    fout<<Solve()<<"\n";
    return 0;
}