#include <fstream>
#include <vector>
using namespace std;
ifstream f("stergeri.in");
ofstream g("stergeri.out");

struct stergere
{
    int x, y;
};

vector<stergere> stergeri;
int n,m,k;
int main()
{
    f>>n>>m>>k;
    stergeri.resize(m);
    for(int i=0;i<m;++i)
        f>>stergeri[i].x>>stergeri[i].y;
    for(int i=m-1;i>=0;--i)
    {
        if(k<stergeri[i].x)
            continue;
        k+=stergeri[i].y-stergeri[i].x+1;
    }
    g<<k;
    return 0;
}