1.var a, b, c :integer;
begin
read(a, b, c);
if (a+b>0) or (a+c>0) or (b+c>=0) then writeln('Yes')
else writeln('No');
end.
2.var a, b :integer;
begin
read(a, b);
if (a=0) and (b=0) then writeln('0')
else if (b=0) then writeln('1')
else if (a=0) then writeln('2')
else writeln('3');
end.
3.var a,b,c:integer;
begin
read(a,b,c);
if (sqr(a)=sqr(b)+sqr(c)) or
(sqr(c)=sqr(a)+sqr(b)) or
(sqr(b)=sqr(c)+sqr(b)) then writeln('Yes')
else writeln('No');
end.