#include <bits/stdc++.h>
using namespace std;
ifstream fin("stergeri.in");
ofstream fout("stergeri.out");
int n, m, k;
pair<int, int> a[100001];
int main()
{
    fin>>n>>m>>k;
    for(int i = 1; i <= m; i++)
    {
        fin>>a[i].first>>a[i].second;
    }
    for(int i = m; i >= 1; i--)
    {
        if(k >= a[i].first)
            k += (a[i].second - a[i].first + 1);
    }
    fout<<k;
    return 0;
}