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