#include<fstream.h>
int main()
{
	ifstream fin("stergeri.in");
	ofstream fout("stergeri.out");
	int i,n,m,k,copym=1,v[1000],x,y,r;
	fin>>n;
	fin>>m;
	fin>>k;
	for(i=0;i<n;i++)
	v[i]=i+1;
	while(copym<=m)
	{
	fin>>x;fin>>y;
	r=y-x+2;
	copym++;
	for(i=x+1;i<n;i++)
	{
	v[i]=v[i+r+2];
	n--;
	i--;
	}
	}
	fout<<v[k]<<endl;
	fin.close();
	fout.close();
	return 0;
}