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