#include<stdio.h>

void run(void){
  int c[26];
  int i;
  for(i=0;i<26;i++){
    scanf("%d",c+i);
  }

  long long int ans=1;
  ans*=c['h'-'a'];
  ans*=c['e'-'a'];
  ans*=c['w'-'a'];
  ans*=c['r'-'a'];
  ans*=c['d'-'a'];
  int t=c['o'-'a']/2;
  ans*=t*(c['o'-'a']-t);

  int k;
  int max=0;
  for(k=2;k<c['l'-'a'];k++){
    int s=k*(k-1)/2*(c['l'-'a']-k);
    max=max<s?s:max;
  }
  ans*=max;
  printf("%lld\n",ans);
  return;
}

int main(void){
  run();
  return 0;
}