var i: integer;
var x: real;
begin
i:=1;
x:=10;
while (x < 25) do
i:=i+1;
x:=x + 0.1 * x;
end;
writeln(i)
end.
var i: integer;
var x: real;
begin
i:=1;
x:=10;
while (x < 25) do
begin
i:=i+1;
x:=x + 0.1 * x;
end;
writeln(i)
end.