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

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.