#include<fstream>
using namespace std;
#define max_m 100010
ifstream f("stergeri.in");
ofstream g("stergeri.out");
int i,n,m,k;
struct interval{     int x ;     int y ; }V[max_m];   void read(){           f>>n>>m>>k;           for(i=1;i<=m;i++)         f>>V[i].x>>V[i].y;       }   void solve(){           for(i=m ; i>=1 ; i-- ){                   if(V[i].x <= k)             k+=(V[i].y - V[i].x + 1);               }           g<<k;       }     int main(){           read();           solve();           return 0; }