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