Problem4318--计算1~n所有3的倍数的和4318: 计算1~n所有3的倍数的和
Time Limit: 1.000 Sec Memory Limit: 128 MB
Submit: 102 Solved: 71
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输入整数n，计算1……n之内所有的3的倍数之和.
Sample Input
9
Sample Output
18
Source/Category
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