var a:array[1..65000] of byte;
    n,m,k,i,j,x,y:longint;
    f,g:text;
begin
assign(f,'stergeri.in');reset(f);
assign(g,'stergeri.out');rewrite(g);
read(f,n,m,k);
for i:=1 to n do a[i]:=i;
for i:=1 to m do begin
                 read(f,x,y);
                 for j:=x to y do a[j]:=a[j+y-x+1];
                 end;
write(g,a[k]);
close(f);
close(g);
end.