View Compilation Error

220600_0_7061.c: In function `main':
220600_0_7061.c:14: error: stray '\' in program
220600_0_7061.c:14: error: `n4' undeclared (first use in this function)
220600_0_7061.c:14: error: (Each undeclared identifier is reported only once
220600_0_7061.c:14: error: for each function it appears in.)