#include <cstdio>
#include <algorithm>
using namespace std;
pair <int,int> v[100005];
int main()
{
    FILE *fin=fopen ("stergeri.in","r");
    FILE *fout=fopen ("stergeri.out","w");
    int n,m,k,i;
    fscanf (fin,"%d%d%d",&n,&m,&k);
    for (i=1;i<=m;i++)
        fscanf (fin,"%d%d",&v[i].first,&v[i].second);
    for (i=m;i>=1;i--){
        if (k>=v[i].first)
            k=k+(v[i].second-v[i].first+1);
    }
    fprintf (fout,"%d",k);
    return 0;
}