#include <fstream>

using namespace std;

int n,k,q,i;

pair <int , int> v[100001];

ifstream fin ("stergeri.in");

ofstream fout ("stergeri.out");

int main (){

    fin>>n>>k>>q;
    for (i=1;i<=k;i++){
        fin>>v[i].first>>v[i].second;
    }
    for (i=k;i>=1;i--){
        if (q >= v[i].first)
            q += v[i].second - v[i].first + 1;
    }
    fout<<q;

    return 0;
}