#include <fstream>
using namespace std;
int n,m,k,i,a1[100010],a2[100010];
int main()
{
    ifstream f("stergeri.in");
    ofstream g("stergeri.out");
    f>>n>>m>>k;
    for(i=1;i<=m;i++)
        f>>a1[i]>>a2[i];
    for (i=m;i>=1;i--)
        if (k>=a1[i])
        k=k+a2[i]-a1[i]+1;
        g<<k<<'\n';
    f.close();
    g.close();
    return 0;
}