program tg;
var a,b,c:realbegin
write('Nhap canh thu nhat ');readln(a);
write('Nhap canh thu hai');readln(b);
write('Nhap canh thu ba');readln(c);
if (a<b+c ) or (b<a+c) or (c<a+b) then writeln(;Day la ba canh tam giac')
else writeln('Day khong phai la ba canh tam giac);
readln
end.