var n,m,k,i,x,y,j:longint;
f,g:text;
v:array[1..2000000000] of longint;
begin
assign(f,'stergeri.in');reset(f);
assign(g,'stergeri.out');rewrite(g);
read(f,n,m,k);
for i:=1 to n do
v[i]:=i;
for i:=1 to m do begin
read(f,x,y);
  for j:=x to n do
    v[j]:=v[j+(y-x+1)];
    n:=n-1;
end;
for i:=1 to k-1 do begin
v[i]:=v[i+1];
k:=k-1;
end;
write(g,v[i],' ');
close(f);
close(g);
end.