The famous Goldbach's conjecture is: "Any even number not less than 6 can be expressed as the sum of two odd prime numbers". How many different prime numbers can be written as the natural number 100?
著名的哥德巴赫猜想是："任何不小于6的偶数都可以表示为两个奇质数之和"．自然数100可以写成多少种不同质数之和的形式．
<result>6</result>