4. Compute the value of adding the following two fuzzy integers:

A = {(0.3,1), (0.6,2), (1,3), (0.7,4), (0.2,5)}

B = {(0.5,11), (1,12), (0.5,13)}

Where fuzzy addition is defined as

μ_{A+B}(z) = max_{x+y=z} (min(μ_{A}(x), μ_{B}(x)))

Then, f(A+B) is equal to