#include<fstream>
using namespace std;
int v[1000010],z[1000010],n,m,k,i;
int main()
{
	ifstream in("stergeri.in");
	ofstream out("stergeri.out");
	in>>n>>m>>k;
	for(i=1;i<=m;i++)
		in>>v[i]>>z[i];
	for(i=m;i>=1;i--)
	{if(k>=v[i])
		k=k+z[i]-v[i]+1;
	}
	out<<k<<'\n';
	return 0;
}