from array import array
X=array("i")
N=int(input())
X=[0]*N
for i in range(0,N):
X[i]=int(input())
min=X[0]
max=X[0]
for i in range(0,N):
if X[i]<min:
min=X[i]
if X[i]>max:
max=X[i]
print(max-min)
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