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def leapyear(year):
    if year%100!=0 :
        if year%4==0:
            return True
    else :
        if year%400==0:
            return True
    return False
def numSunday(year):
    firstSun=1
    first=1
    numSundays=0
    for i in range(1900, year+1):
        #jan
        firstSun=(firstSun+31)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #feb
        if leapyear(year):
            firstSun=(firstSun+29)%7
            if firstSun==0:
                if i==year:
                    numSundays+=1
        else :
            firstSun=(firstSun+28)%7
            if firstSun==0:
                if i==year:
                    numSundays+=1
        #mar
        firstSun=(firstSun+31)%7
        print (firstSun)
        if firstSun==0:
            if i==year:
                numSundays+=1
        #apr
        firstSun=(firstSun+30)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #may
        firstSun=(firstSun+31)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #june
        firstSun=(firstSun+30)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #july
        firstSun=(firstSun+31)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #aug
        firstSun=(firstSun+31)%7
        if firstSun==0:
            numSundays+=1
        #sept
        firstSun=(firstSun+30)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #oct
        firstSun=(firstSun+31)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #nov
        firstSun=(firstSun+30)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
        #dec
        firstSun=(firstSun+31)%7
        if firstSun==0:
            if i==year:
                numSundays+=1
    
    return numSundays
print (numSunday(1900))