#include <iostream>
#include<fstream>
using namespace std;
const int nmax=100005;
int st[nmax],dr[nmax],i,n,m,k;
int main()
{
    ifstream f("stergeri.in");
    ofstream g("stergeri.out");
    f>>n>>m>>k;
    for(i=1;i<=m;i++)
        f>>st[i]>>dr[i];
    for(i=m;i>=1;i--)
        if(k>=st[i])
         k+=dr[i]-st[i]+1;
        g<<k;
    return 0;
}