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# Uses python3
import sys
def getFibLastDigitNaive(n):
if n <= 1:
return n
previous = 0
current = 1
for _ in range(n - 1):
previous, current = current, previous + current
return current % 10
def getFibLastDigitOptimized(n):
if (n <= 1):
return n
fibLst = [None] * (n+1)
fibLst[0] = 0
fibLst[1] = 1
for i in range(2, n+1):
fibLst[i] = (fibLst[i-1] + fibLst[i-2]) % 10
return fibLst[n]
if __name__ == '__main__':
input = sys.stdin.read()
n = int(input)
print(getFibLastDigitOptimized(n))
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