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#include <bits/stdc++.h>

using namespace std;

#define int long long

signed main(){
    cin.tie(0)->sync_with_stdio(0);
    string s1, s2, s3;
    cin>>s1>>s2>>s3;

    vector<int> groups;
    bool last_ok = false;
    bool last_carry = false;
    for(int i = s1.size() - 1; i>=0 ;i--){
        if(!last_ok) groups.push_back(0);
        int tmp = ((last_carry)?1:0);
        int d1 = s1[i] - '0';
        int d2 = s2[i] - '0';
        int d3 = s3[i] - '0';
        tmp += d1 + d2;
        if(last_carry and tmp % 10 != d3){
            last_ok = false;
            last_carry = false;
            groups.push_back(0);
        } else if(last_carry){
            last_ok = true;
            last_carry = (tmp > 9);
            if(!last_carry) groups.back()++;
            continue;
        }

        tmp = d1 + d2;
        if(tmp % 10 != d3){
            last_ok = false;
            last_carry = false;
            continue;
        } 
        groups.back()++;
        last_ok = true;
        last_carry = (tmp > 9);
        if(last_carry) groups.back()--;
    }

    int result = 0;
    for(int val : groups){
        result += ((val + 1) * val) / 2;
    }

    cout<<result<<endl;
    return 0;
}