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import sys

def perpetum_mobile():
    le1 = sys.stdin.readline()
    le2 = sys.stdin.readline()
    le3 = sys.stdin.readline()
    dobre = 0
    for p_i in range(len(le1)-1):
        for p_j in range(p_i, len(le1)-1):
            licz1 = int(le1[p_i:p_j+1])
            licz2 = int(le2[p_i:p_j+1])
            licz3 = int(le3[p_i:p_j+1])
            if licz1 + licz2 == licz3:
                dobre += 1

    print(dobre)


perpetum_mobile()