#include <fstream>

using namespace std;

ifstream f("stergeri.in");
ofstream g("stergeri.out");

int n,m,k,i,a1[100010],a2[100010];

int main() {
    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;
}