program gfg;
uses crt;
var a,b,c,d,e,z:real;
Begin
writeln('vvedite 1 osnovanie');
readln(a);
writeln('vvedite 2 osnovanie');
readln(b);
writeln('vvedite visoty');
readln(c);
d:=(a-b)/2;
e:=sqrt(sqr(d)+sqr(c));
z:=e*2+a+b;
writeln('perimetr');
writeln(z);
end.