View Compilation Error

0_0_2773119_10974.cpp: In function `long long int Josephus(long long int, long long int, long long int)':
0_0_2773119_10974.cpp:30: error: `x' undeclared (first use this function)
0_0_2773119_10974.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)