program z1683;
uses crt;
const n=5;
var a:array[1..n]of word;
i,max,d:word;
BEGIN
for i:=1 to n do readln (a[i]);
max:=0;
for i:=1 to n do
if (a[i]>0) and (a[i]>max) then max:=a[i];
if max<>0 then writeln('maxim chislo-',max)
else writeln('chisel net');
readln;
END.