From the number of people and the number of handshakes, we can know that he shook hands with five other people because he clearly shook hands five times; Sisi only shakes hands 1 time, and he can only shake hands with Mingming; Dongdong shook hands four times, so he shook hands with four people other than Sisi. Quietly shook hands twice. He shook hands with Mingming and Dongdong. Light light blue shook hands three times. He shook hands with Mingming, Dongdong and Mao Mao, so Mao Mao shook hands with Mingming, Dongdong and Light Light Blue, and shook hands with * * * three times.

answer

Solution: Yao Ming shook hands five times, so he shook hands with five other people.

Sisi only shakes hands 1 time, and he can only shake hands with Mingming;

Dongdong shook hands four times, so he shook hands with four people other than Sisi.

Quietly shook hands twice. He shook hands with Mingming and Dongdong. Light light blue shook hands three times. He shook hands with Mingming, Dongdong and Mao Mao.

So Mao Mao shook hands with Mingming, Dongdong and Light Light Light Blue, and shook hands with * * * three times.

So the answer is: 3.