/*stergeri*/

#include<fstream.h>
#include<string.h>

long n,m,k,x,y;

ifstream fin("stergeri.in");
ofstream fout("stergeri.out");
struct o
{
	long x,y;
}op[100002];
int main()
{
	long i;
	fin>>n>>m>>k;

	
	for(i=0;i<m;i++)
		fin>>op[i].x>>op[i].y;
	
	for(i=m-1;i>=0;i--)
	{
		if(op[i].x<=k)
			k=k+op[i].y-op[i].x+1;
	}

	fout<<k;
	fout.close();
	return 0;
}