program paralepiped;
var a,b,c,v:real;
begin
 writeln('vvedite a:');
 readln(a);
 writeln('vvedite b:');
 readln(b);
 writeln('vvedite c:');
 readln(c);
 v:=a*b*c;
writeln('v=',v);
readln;
end.