#include <bits/stdc++.h>
#define N 100001
using namespace std;

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

int dr[N],st[N];
int main()
{

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