count=0
x=[]
y=[]
for X in range(1,13):
    if X == 1 or 3 or 5 or 7 or 8 or 10 or 12:
        for Y in range(1,31):
            Y10=int(Y//10)
            Y1=Y%10
            if X == Y10+Y1:
                count+=1
                x.append(X)
                y.append(Y)

    elif X == 4 or 6 or 9 or 11:
        for Y in range(1,30):
            Y10=int(Y//10)
            Y1=Y%10
            if X == Y10+Y1:
                count+=1
                x.append(X)
                y.append(Y)

    else:
        for Y in range(1,28):
            Y10=int(Y//10)
            Y1=Y%10
            if X == Y10+Y1:
                count+=1
                x.append(X)
                y.append(Y)

print(count,"\n")
#print(x,len(x),"\n")
#print(y,len(y),"\n")