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

        }
    }
    fout<<k<<"\n";




    return 0;
}