The error tells you exactly what is wrong and where IndentationError: expected an indented block (line 7). You need to indent lines in your if clause:

if value > 1:
    outraster = (f1 + f2 + f3)/3
else:
    outraster = (f1 + f2 +f3)/3 - 1

However, this code won't do what you want it to. You need to use Con:

f123 = f1 + f2 + f3
outraster = Con(f123 > 0, f123 / 3, f123 / 3 - 1)
outraster.save(filepath)

The error tells you exactly what is wrong and where IndentationError: expected an indented block (line 7). You need to indent lines in your if clause:

if value > 1:
    outraster = (f1 + f2 + f3)/3
else:
    outraster = (f1 + f2 +f3)/3 - 1

However, this code won't do what you want it to. You need to use Con:

f123 = f1 + f2 + f3
outraster = Con(f123 > 0, f123 / 3, f123 / 3 - 1)
outraster.save('S:/npenme2/Faunalyze/rasterCalc')

The error tells you exactly what is wrong and where IndentationError: expected an indented block (line 7). You need to indent lines in your if clause:

if value > 1:
    outraster = (f1 + f2 + f3)/3
else:
    outraster = (f1 + f2 +f3)/3 - 1

The error tells you exactly what is wrong and where IndentationError: expected an indented block (line 7). You need to indent lines in your if clause:

if value > 1:
    outraster = (f1 + f2 + f3)/3
else:
    outraster = (f1 + f2 +f3)/3 - 1

However, this code won't do what you want it to. You need to use Con:

f123 = f1 + f2 + f3
outraster = Con(f123 > 0, f123 / 3, f123 / 3 - 1)
outraster.save(filepath)