program ideone;
var
a,b,c,max,min,sxvaoba :integer;
begin
readln(a);
readln(b);
readln(c);
if (a > b) and (b > c) then
begin
max := a;
min := c;
end
else if (a > c) and (c > b) then
begin
max := a;
min := b;
end
else if(b > a) and (a > c) then
begin
max := b;
min := c;
end
else if(b > c) and ( c > a) then
begin
max := b;
min := a;
end
else if(c > b) and (b>a) then
begin
max := c;
min := a;
end
else if (c > a) and (a > b) then
begin
max := c;
min := b;
end;
sxvaoba := max - min;
writeln(sxvaoba);
end.
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