#include<fstream>
using namespace std;
ifstream in("stergeri.in");
ofstream out("stergeri.out");
int n,m,k,x[100001],y[100001];
int main()
{
    in>>n>>m>>k;
    for(int i=1; i<=m; i++)
        in>>x[i]>>y[i];
    for(int i=m; i>=1; i--)
        if(k>=x[i])
            k=k+y[i]-x[i]+1;
    out<<k;
    in.close();
    out.close();
    return 0;
}