var
a:array[1..15] of real;
i:integer;
s:real;
begin
s:=100;
a[1]:=50;
a[2]:=50;
for i:= 2 to 15 do
begin
a[i+1]:=a[i]*2;
s:=s+a[i];
end;
writeln((s+a[1]+a[2]):6:2);
readln
end.
var
a:array[1..15] of real;
i:integer;
s:real;
begin
s:=100;
a[1]:=50;
a[2]:=50;
for i:= 2 to 15 do
begin
a[i+1]:=a[i]*2;
s:=s+a[i];
end;
writeln((s+a[1]+a[2]):6:2);
readln
end.