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

ifstream fin("stergeri.in");
ofstream fout("stergeri.out");

int n,m,k,x,y,i;

struct o
{
	int x,y;
} op[100002];

int main(){

	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;
}