#include<fstream>
using namespace std;
ifstream in("stergeri.in");
ofstream out("stergeri.out");
const int NMAX = 100000;

struct del{
    int x,y;
};
del v[NMAX + 10];
int n,k,m;

void read()
{

    in>>n>>m>>k;
    int a,b;
    for(int i = 1 ; i <= m ; i++){
        in>>a>>b;
        v[i].x = a;
        v[i].y = b;
    }
    in.close();
}

void solve()
{
    for(int i = m ; i >= 1 ; i--){

        if(v[i].x <= k)
            k = k + v[i].y-v[i].x+1;

    }
    out<<k;
    out.close();
}

int main()
{

    read();
    solve();
    return 0;
}