#1646. 【入门】八进制转十进制
【入门】八进制转十进制
说明
请将一个20位以内的八进制数转换为十进制整数输入格式
20位以内的八进制数输出格式
该数对应的十进制数77777777777777777777
1152921504606846975
77777777777777777777
1152921504606846975
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