program ime;
var a:array [1..100,1..100] of integer;
var x,n,y: integer;
begin
readln(n);
for x:= 1 to n do
begin
for y:= 1 to 2 do
read (a[x,y]);
readln;
end;
if (a[1,1]>a[1,2]) then writeln(a[1,1]-a[1,2])
else if (a[1,1]<a[1,2]) then writeln (a[1,2]*a[1,1]);
readln;
end.