227C - Flying Saucer Segments - CodeForces Solution

math *1400

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Python Code: 

def pow1(z,x):
    if x==0:return 1
    sq=pow1(z,x//2)
    sq=sq*sq
    if x%2==1:
        sq=sq*z
    return sq%m

n,m=map(int,input().split()) ; a=pow1(3,n)-1
if a==-1:
    print(m-1)
else:
    print(a)


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