#include <fstream>
using namespace std;
ifstream fin("stergeri.in");
ofstream fout("stergeri.out");
int n,k,q,i;
pair <int, int> v[100005];
int main()
{
    fin>>n>>k>>q;
    for(i=1;i<=k;i++)
    {
        fin>>v[i].first>>v[i].second;
    }
    for(i=k;i>=1;i--)
    {
        if(q>=v[i].first)
        {
            q+=v[i].second-v[i].first+1;
        }
    }
    fout<<q;
    return 0;
}