#include <fstream>
#define nmax 100001
#define f for

using namespace std;

ifstream fin("stergeri.in");
ofstream fout("stergeri.out");

int n,m,k,i;

struct numere
{
    int a;
    int b;
};

numere v[nmax];

int main()
{
    fin>>n>>m>>k;
    f(i=1;i<=n;i++)
        fin>>v[i].a>>v[i].b;
    f(i=m;i>=1;i--)
    {
        if(k>v[i].b)
        {
            k+=v[i].b-v[i].a+1;
        }
        else if(k<=v[i].b && k>=v[i].a)
        {
            k+=v[i].b-v[i].a+1;
        }

    }
    fout<<k<<'\n';
    return 0;
}