#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

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

int main()
{
    int n, m, k;
    fin>>n>>m>>k;
    vector <pair<int, int>> ops;
    int i;
    for(i=0; i<m; i++)
    {
        int a, b;
        fin>>a>>b;
        ops.push_back({a,b});
    }
    for(i=m-1; i>=0; i--)
    {
        if(k >= ops[i].first)
        {
            k += ops[i].second-ops[i].first+1;
        }
    }
    fout<<k;
}