import math
M = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
ans = 0
for i, m in enumerate(M):
    for j in range(1, m+1):
        if (j%10 + math.floor(j/10)) == (i+1):
            ans += 1
print(ans)