var t,n,x,y,i,m,k,j:longint;
    a:array[1..200000000] of int64;
begin
assign(input,'stergeri.in');reset(input);
assign(output,'stergeri.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 j:=x to n-t do
   a[j]:=a[j+t];
n:=n-t;
end;
write(a[k]);
close(input);close(output);
end.