#include <bits/stdc++.h>

using namespace std;

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

vector <pair<int,int> > V;

int main()
{
    int n,m,k;
    fin >> n >> m >> k;
    for(int i = 0; i < m; i++)
    {
        int a,b;
        fin >> a >> b;
        V.push_back({a,b});
    }
    for (int i = m-1; i >= 0 ; i--)
    {
        if (k < V[i].first)
            continue;
        else k = k + V[i].second - V[i].first + 1;
    }
    cout << k;
    return 0;
}