S = input().strip()
count = 0

# Apply Operation 1 as much as possible initially
while True:
    new_S = S.replace("phnom", "penh", 1)
    if new_S != S:
        count += 1
        S = new_S
    else:
        break

prev_count = -1

# Keep applying operations until no more changes
while count != prev_count:
    prev_count = count
    # Apply Operation 2 steps
    op2_applied = False
    while True:
        # Apply Operation 2 once
        new_S = S.replace('h', '')
        new_S = new_S.replace('e', 'h')
        if new_S != S:
            count += 1
            S = new_S
            op2_applied = True
        else:
            break
        # After each Operation 2, check for Operation 1
        while True:
            new_S_op1 = S.replace("phnom", "penh", 1)
            if new_S_op1 != S:
                count += 1
                S = new_S_op1
            else:
                break

print(count)