#include <iostream>
#include <fstream>
#include <utility>
#include <vector>
#define Nmax 100009
using namespace std;
ifstream fin("stergeri.in");
ofstream fout("stergeri.out");

int n,m,k;
vector <pair<int,int>> v(Nmax);
int main()
{

fin>>n>>m>>k;
for (int i=0;i<m;i++)
    fin>>v[i].first>>v[i].second;

    for (int i=m-1;i>=0;i--)
        if (k>=v[i].first)
        k+=v[i].second-v[i].first+1;
    fout<<k;
    return 0;
}