#include <iostream>
#include <fstream>
#include <algorithm>
#include <bitset>

using namespace std;
ifstream fin ("stergeri.in");
ofstream fout("stergeri.out");
int i,m;
long long n,k,x[100002],y[100002];

int main()
{
    fin>>n>>m>>k;
    for(i=1;i<=m;i++)
        fin>>x[i]>>y[i];
    for(i=m;i>=1;i--)
        if(k>=x[i])
            k=k+y[i]-x[i]+1;
    fout<<k;
    fin.close();
    fout.close();
    return 0;
}