var t,n,x,y,i,m,k:longint;
    a:array[1..20000000] of longint;
begin
assign(input,'alexc.in');reset(input);
assign(output,'alexc.out');rewrite(output);
readln(n,m,k);
for i:=1 to n do
a[i]:=i;
for i:=1 to m do begin
readln(x,y);
t:=y-x+1;
 for i:=x to n-t do
   a[i]:=a[i+t];
n:=n-(y-x+1);
end;
write(a[k]);
close(input);close(output);
end.