#include<fstream>
#include<algorithm>
#include<vector>
#define Nmax 100005
#define d int
using namespace std;

    ifstream f("stergeri.in");
    ofstream g("stergeri.out");
d n,m,k,a,b;
d A[Nmax],B[Nmax];

void solve(int k)
{
	int i,contor=0;
	for(i=m;i;i--)
		if(k>=A[i])
		contor=contor+B[i]-A[i]+1;
	k=k+contor;
	g<<k;
		
}
int main()
{
	f>>n>>m>>k;
	int i;
	for(i=1;i<=m;i++)
		f>>A[i]>>B[i];
	solve(k);
	f.close();
	g.close();
	return 0;
}