#include <cstdio>
#include <stack>
#define filein "stergeri.in"
#define fileout "stergeri.out"
using namespace std;

struct interval
{
    int x;
    int y;
};
stack <interval> s;

int n,m,k;

void citire();
void stergere();
void afisare();

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

void citire()
{
    FILE *in;
    in=fopen(filein,"r");
    fscanf(in,"%d %d %d",&n,&m,&k);
    interval aux;
    int i;
    for (i=1; i<=m; i++)
    {
        fscanf(in,"%d %d",&aux.x,&aux.y);
        s.push(aux);
    }
    fclose(in);
}

void stergere()
{
    int x,y;
    while (!s.empty())
    {
        x=(s.top()).x;
        y=(s.top()).y;
        if (k>=x)
            k=k+y-x+1;
        s.pop();
    }
}

void afisare()
{
    FILE *out;
    out=fopen(fileout,"w");
    fprintf(out,"%d",k);
    fclose(out);
}