#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;
}