#include<iostream>
#include<fstream>
using namespace std;
 int i,k,m,n,x[100004],y[100004];
int main ()
{
    ifstream cin ("stergeri.in");
    ofstream cout ("stergeri.out");
    cin>>n>>m>>k;
    
    for (i=1;i<=m;i++)
    cin>>x[i]>>y[i];// x -indicele lui Frasinel // y- indicele lui Frasinel
    
    for (i=m;i>=1;i--)
    {
        if ( k>=x[i] )
        k=k+x[i]-y[i]+1;
        }
    cout<<k;
    cin.close();
    cout.close();
    return 0;
}