#include <stdio.h>

using namespace std;

FILE*f=fopen("stergeri.in","r"),*g=fopen("stergeri.out","w");

struct multime
{
    int s,d;
}v[100005];

int n,m,k;

void citire()
{
    fscanf(f,"%d %d %d",&n,&m,&k);
    for(int i = 1; i <= m; i++)
    {
        fscanf(f,"%d %d",&v[i].s,&v[i].d);
    }
}

int main()
{
    citire();
    for(int i = m; i >= 1; i--)
    {
        if(v[i].s <= k)
        {
            k += v[i].d-v[i].s + 1;
        }
    }
    fprintf(g,"%d ",k);
    return 0;
}