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