#include <bits/stdc++.h>
 
using namespace std;
 
ifstream in("stergeri.in");
ofstream out("stergeri.out");

int main() {
    ios::sync_with_stdio(false); in.tie(0); out.tie(0);
    
    int n, m, k; in >> n >> m >> k;

    vector< pair< int, int > > queries(m);
    for(auto &it: queries) in >> it.first >> it.second;

    for(int i = m - 1; i >= 0; --i) {
        if(k < queries[i].first) {
            continue;
        }

        k += (queries[i].second - queries[i].first + 1);
    }

    out << k << "\n";

    in.close(); out.close();
 
    return 0;
}