#include <stdio.h>

using namespace std;

int n,m,k,a[100001][2];

void citire()
{
    freopen("stergeri.in","r",stdin);
    scanf("%d%d%d", &n, &m, &k);
    for (int i=0; i<m; i++)
        scanf("%d%d", &a[i][0], &a[i][1]);
    fclose(stdin);
}

void rezolvare()
{
    for (int i=m-1; i>=0; i--)
    {
        if (a[i][0]<=k)
            k+=a[i][1]-a[i][0]+1;
    }
}

void afisare()
{
    freopen("stergeri.out","w",stdout);
    printf("%d", k);
    fclose(stdout);
}

int main()
{
    citire();
    rezolvare();
    afisare();
    return 0;
}