#include <stdio.h>
#define NMax 100005

long n, m, k;
struct caz{ long x,y; }a[NMax];

FILE *f, *g;

void citire();
void rez();

int main()
{
	citire();
	rez();
	return 0;
}
void rez()
{
	int i;

	for (i=m; i>0; i--)
		if ( k > a[i].x )
			k += ( a[i].y - a[i].x + 1 );
	fprintf( g, "%ld", k );
}
void citire()
{
	int i;
	f = fopen( "stergeri.in", "rt" );
	g = fopen( "stergeri.out", "wt" );

	fscanf( f, "%ld %ld %ld", &n, &m, &k );
	for (i=1; i<=m; i++)
		fscanf( f, "%d %d", &a[i].x, &a[i].y );
}