1. The problem is to count the number of members (heads) without using decimals or fractions. 2. When counting discrete objects like people, the count must be a whole number (integer) because you cannot have a fraction or decimal of a person. 3. The rule is that the count must be a non-negative integer: $0, 1, 2, 3, \ldots$ 4. If you have a calculation that results in a decimal or fraction, you must round or truncate to the nearest whole number depending on context. 5. For example, if you calculate $3.7$ members, you cannot have $0.7$ of a member, so you round to $4$ or $3$ based on the situation. 6. Always ensure the final answer for counting members is an integer with no decimals or fractions.