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View Compilation Error

0_0_30431961_21091.cpp: In function 'int main()':
0_0_30431961_21091.cpp:25:26: error: 'M_E' was not declared in this scope
         lolong(log10(n * M_E * 2) * 0.5 + log10(n / M_E) * n + 1));
                          ^


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