有5个人坐在一起，问第5个人多少岁，他说比第4个人大2岁。问第4个人多少岁，他说比第3个人大2岁。问第3人多少岁，他说比第2个人大2岁。问第2个人多少岁，他说比第1个人大2岁。最后问第1个人，他说他是10岁。编写程序，当输入第几个人时求出其对应的年龄。(5 people sat together and asked how old fifth people were. He said he was 2 years older than fourth. Asked how old fourth people, he said, 2 years older than third people. Asked how old the third were, he said, 2 years older than second. Asked how old second people, he said, 2 years older than first people. Finally asked first people, he said he was 10 years old. Write a program to determine the age when you enter the first few.)