View Compilation Error

0_0_8566225_315.cpp: In function `long long int han(long long int)':
0_0_8566225_315.cpp:10: error: `retutn' undeclared (first use this function)
0_0_8566225_315.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8566225_315.cpp:13: error: expected `;' before '}' token
0_0_8566225_315.cpp: At global scope:
0_0_8566225_315.cpp:15: error: `main' must return `int'