#include<cstdio>
using namespace std;
FILE*in=fopen("stergeri.in","r");
FILE*out=fopen("stergeri.out","w");
const int NMAX=100006;
int n,m,k,i;
struct qer
{
    int x,y;
};
qer v[NMAX];
int main()
{
    fscanf(in,"%d%d%d",&n,&m,&k);
    for(i=1;i<=m;i++)
    {
        fscanf(in,"%d%d",&v[i].x,&v[i].y);
    }
    for(i=m;i>=1;i--)
    {
        if(v[i].x<=k)
        {
            k=k+v[i].y-v[i].x+1;
        }
    }
    fprintf(out,"%d",k);
}