#include<stdio.h>
FILE*fin,*fout;
unsigned long int n,m,k,v[2000000000],i,j,x,y,sol,l,g;
int main(){
  fin=fopen("stergeri.in","r");
  fout=fopen("stergeri.out","w");
  fscanf(fin,"%ld %ld %ld\n",&n,&m,&k);
    for(i=1;i<=n;i++){v[i]=i;}
    for(g=1;g<=m;g++){
    fscanf(fin,"%ld %ld\n",&x,&y);                  
    for(i=x;i<=n;i++){v[i]=v[y+1];n--;y++;}

    }
    fprintf(fout,"%ld",v[k]);
    fclose(fin);            fclose(fout);
return 0;
}