int main(){
int sz[100];
int n,i,a,b,c,d;
double w,x,y,z;
scanf("%d\n",&n);

a=0;
b=0;
c=0;
d=0;

for(i=0;i<n;i++)
{scanf("%d ",&(sz[i]));
if(sz[i]<=18)a++;else{
if(sz[i]<=35)b++;else{
if(sz[i]<=60)c++;
else d++;}}
}
w=a*1.0/n*100;
x=b*1.0/n*100.0;
y=c*1.0/n*100.0;
z=d*1.0/n*100.0;
printf("1-18: %.2lf%\n",w);
printf("19-35: %.2lf%\n",x);
printf("36-60: %.2lf%\n",y);
printf("60??: %.2lf%\n",z);
return 0;
}