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

using ll = int64_t;

vector<int> tv(string s) {
  vector<int> ans;
  for(auto c : s) {
    ans.push_back(c - '0');
  }
  return ans;
}

void solve() {
  string sa, sb, sc;
  cin >> sa >> sb >> sc;

  vector<int> a = tv(sa);
  vector<int> b = tv(sb);
  vector<int> c = tv(sc);

  ll zero = (a[0] + b[0] == c[0]);
  ll one = (a[0] + b[0] + 1 == c[0]);
  ll ans = zero;

  int n = a.size();
  for(int i = 1; i < n; i++) {
    ll nz = 0;
    ll no = 0;

    ll v = a[i] + b[i];
    if(v % 10 == c[i]) {
      if(v < 10) {
        nz = zero + 1;
      }
      else {
        nz = one;
      }
    }

    v++;
    if(v % 10 == c[i]) {
      if(v < 10) {
        no = zero + 1;
      }
      else {
        no = one;
      }
    }

    one = no;
    zero = nz;
    ans += zero;
  }

  cout << ans;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  //freopen("in", "r", stdin);
  solve();
}