#include <iostream>
#include<fstream>
using namespace std;
typedef struct
{
    int x,y;
}STRUCT;
STRUCT v[100000];
int main()
{
    ifstream f("stergeri.in");
    ofstream g("stergeri.out");
    long n;
    int m,k,i;
    f>>n>>m>>k;
    for(i=1;i<=m;i++)
    {
        f>>v[i].x>>v[i].y;
    }
    for(i=m;i>=1;i--)
        if(k>=v[i].x)k=k+v[i].y-v[i].x+1;
    g<<k;
    f.close();
    g.close();
    return 0;
}