number = str(input())[::-1]
remainderDictionary = {0: 1}
digitDictionary = {'1':1, '2':2, '3':3, '4':4, '5':5, '6':6, '7':7, '8':8, '9':9}

sum = 0
x = 1
for i in number:
  x = (x * 10) % 2019
  sum = (sum + digitDictionary[i] * x) % 2019 
  remainderDictionary[sum] = remainderDictionary.get(sum,0) + 1

ansDictionary = 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783:1588653,1784:1590436,1785:1592220,1786:1594005,1787:1595791,1788:1597578,1789:1599366,1790:1601155,1791:1602945,1792:1604736,1793:1606528,1794:1608321,1795:1610115,1796:1611910,1797:1613706,1798:1615503,1799:1617301,1800:1619100,1801:1620900,1802:1622701,1803:1624503,1804:1626306,1805:1628110,1806:1629915,1807:1631721,1808:1633528,1809:1635336,1810:1637145,1811:1638955,1812:1640766,1813:1642578,1814:1644391,1815:1646205,1816:1648020,1817:1649836,1818:1651653,1819:1653471,1820:1655290,1821:1657110,1822:1658931,1823:1660753,1824:1662576,1825:1664400,1826:1666225,1827:1668051,1828:1669878,1829:1671706,1830:1673535,1831:1675365,1832:1677196,1833:1679028,1834:1680861,1835:1682695,1836:1684530,1837:1686366,1838:1688203,1839:1690041,1840:1691880,1841:1693720,1842:1695561,1843:1697403,1844:1699246,1845:1701090,1846:1702935,1847:1704781,1848:1706628,1849:1708476,1850:1710325,1851:1712175,1852:1714026,1853:1715878,1854:1717731,1855:1719585,1856:1721440,1857:1723296,1858:1725153,1859:1727011,1860:1728870,1861:1730730,1862:1732591,1863:1734453,1864:1736316,1865:1738180,1866:1740045,1867:1741911,1868:1743778,1869:1745646,1870:1747515,1871:1749385,1872:1751256,1873:1753128,1874:1755001,1875:1756875,1876:1758750,1877:1760626,1878:1762503,1879:1764381,1880:1766260,1881:1768140,1882:1770021,1883:1771903,1884:1773786,1885:1775670,1886:1777555,1887:1779441,1888:1781328,1889:1783216,1890:1785105,1891:1786995,1892:1788886,1893:1790778,1894:1792671,1895:1794565,1896:1796460,1897:1798356,1898:1800253,1899:1802151,1900:1804050,1901:1805950,1902:1807851,1903:1809753,1904:1811656,1905:1813560,1906:1815465,1907:1817371,1908:1819278,1909:1821186,1910:1823095,1911:1825005,1912:1826916,1913:1828828,1914:1830741,1915:1832655,1916:1834570,1917:1836486,1918:1838403,1919:1840321,1920:1842240,1921:1844160,1922:1846081,1923:1848003,1924:1849926,1925:1851850,1926:1853775,1927:1855701,1928:1857628,1929:1859556,1930:1861485,1931:1863415,1932:1865346,1933:1867278,1934:1869211,1935:1871145,1936:1873080,1937:1875016,1938:1876953,1939:1878891,1940:1880830,1941:1882770,1942:1884711,1943:1886653,1944:1888596,1945:1890540,1946:1892485,1947:1894431,1948:1896378,1949:1898326,1950:1900275,1951:1902225,1952:1904176,1953:1906128,1954:1908081,1955:1910035,1956:1911990,1957:1913946,1958:1915903,1959:1917861,1960:1919820,1961:1921780,1962:1923741,1963:1925703,1964:1927666,1965:1929630,1966:1931595,1967:1933561,1968:1935528,1969:1937496,1970:1939465,1971:1941435,1972:1943406,1973:1945378,1974:1947351,1975:1949325,1976:1951300,1977:1953276,1978:1955253,1979:1957231,1980:1959210,1981:1961190,1982:1963171,1983:1965153,1984:1967136,1985:1969120,1986:1971105,1987:1973091,1988:1975078,1989:1977066,1990:1979055,1991:1981045,1992:1983036,1993:1985028,1994:1987021,1995:1989015,1996:1991010,1997:1993006,1998:1995003,1999:1997001,2000:1999000,2001:2001000,2002:2003001,2003:2005003,2004:2007006,2005:2009010,2006:2011015,2007:2013021,2008:2015028,2009:2017036,2010:2019045,2011:2021055,2012:2023066,2013:2025078,2014:2027091,2015:2029105,2016:2031120,2017:2033136,2018:2035153}
ans = 0
for i in remainderDictionary:
  ans += ansDictionary[ remainderDictionary[i] ]
print(ans)

### FIXED CODE ###

number = str(input())[::-1]
remainderDictionary = {0: 1}
    
sum = 0
x = 1
for i in number:
  x = (x * 10) % 2019
  sum += int(i) * x
  sum %= 2019
  remainderValue = remainderDictionary.get(sum,0) + 1
  remainderDictionary[sum] = remainderValue
     
ans = 0
for i in remainderDictionary:
  value = remainderDictionary[i]
  ans += value * (value - 1) // 2 # N C 2
print(ans)