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#include <iostream>
#include <string>

using namespace std;

typedef long long LL;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    LL wyn=0;
    string a, b, c;
    cin>>a>>b>>c;

    LL bp=0, zp=0;
    for (int i=a.size()-1; 0<=i; --i)
    {
        int aa=a[i]-'0';
        int bb=b[i]-'0';
        int cc=c[i]-'0';
        if (aa+bb==cc)
        {
            ++bp;
            wyn+=bp;
            zp=0;
        }
        else if (aa+bb+1==cc)
        {
            wyn+=zp;
            bp=zp;
            zp=0;
        }
        else if (aa+bb==cc+10)
        {
            zp=bp+1;
            bp=0;
        }
        else if (aa+bb+1==cc+10)
        {
            bp=0;
        }
        else
        {
            bp=zp=0;
        }
    }

    cout<<wyn<<endl;
    return 0;
}