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#include "bits/stdc++.h"
using namespace std;

using ll = long long;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    string a, b, c;
    cin >> a >> b >> c;
    int n = (int)a.size();

    ll ans = 0, cnt = 0;
    int carry = 0;
    for (int i = n - 1; i >= 0; i--) {
        int x = a[i] - '0';
        int y = b[i] - '0';
        int z = c[i] - '0';
        int w = x + y;
        if (carry && (w + 1) % 10 == z) {
            w++;
            if (w >= 10) carry = 1;
            else carry = 0, ans += cnt;
        } else if (w % 10 == z) {
            if (carry) cnt = 0;
            if (w >= 10) carry = 1, cnt++;
            else ans += ++cnt, carry = 0;
        } else {
            cnt = 0;
            carry = 0;
        }
    }
    cout << ans << '\n';
}