var a:array[1..32000] of integer;
    n,m,k,x,y,i,j,d,p:longint;
    f,g:text;
begin
assign(f,'stergeri.in');
assign(g,'stergeri.out');
reset(f);
rewrite(g);
readln(f,n,m,k);
for i:=1 to n do a[i]:=i;
for i:=1 to m do begin
                 readln(f,x,y);
                 d:=y-x;
                 for j:=x to n-x+1 do p:=a[j];
                 n:=n-(d+1);
                 end;
write(g,a[k]);
close(f);
close(g);
end.