let a = gets();
  a=a.split('');
  let fin=0;



 if (a[0]==0||a[1]==0||a[2]==0) {
   a.sort(function(a, b){return a - b});
   if (a[1]*a[2]<=Number(a[1])+Number(a[2])) {

     fin =Number(a[1])+Number(a[2]);
   }
   else{fin=Number(a[1])*Number(a[2])}
 }
 if (a[0]!=0&&a[1]!=0&&a[2]!=0) {
   a.sort(function(a, b){return a - b});
   if (a[0]==1) {

     fin=Number(a[0])+Number(a[1])*Number(a[2]);
   }
   else{fin=Number(a[0])*Number(a[1])*Number(a[2]);}
 }
 if (a[0]==1&&a[1]==1&&a[2]==1) {
  fin=3;
}
print(fin);