#include <fstream> 
using namespace std; 
int n,m,k,i,a1[100010],a2[100010]; 
int main() 
{    

     ifstream f("stergeri.in"); 
     ofstream g("stergeri.out"); 
   
     f>>n>>m>>k; 
   
     for(i=1;i<=m;i++) 
     f>>a1[i]>>a2[i]; 
   
     for (i=m;i>=1;i--) 
         if (k>=a1[i]) 
         k=k+a2[i]-a1[i]+1; 
        
        g<<k<<'\n'; 
   
   f.close(); 
   g.close(); 
   return 0; 
}