#include <iostream>
#include <fstream>
#include <string>
#include <algorithm>
#include <vector>
#include <map>
#include <queue>

#define LL long long
#define ULL unsigned long long
#define PB push_back

using namespace std;

ifstream in("stergeri.in");
ofstream out("stergeri.out");
int N,M,K;

void get(int M){
     if (M){                         
        int A,B;
        in >> A >> B;
        get(M-1);    
        if (K<A) {} 
        else  K += (B-A+1);        
        return;
     }
     return;
}

int main(void){

   in >> N >> M >> K;
   
   get(M);
   
   out << K;
   
   in.close();
   out.close();

   return 0;
}