const k=5;
var n,s:array[1..k] of integer;
    i,i2,i3:integer;
begin
for i:=1 to k do
   read(n[i]);
for i:=1 to k do
   for i2:=1 to k do
      if n[i]=n[i2] then
         s[i]:=s[i]+1;

for i:=1 to k do
   if s[i]>i3 then
      i3:=s[i];
writeln(i3);
end.