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

typedef long long LL;

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

	string s;
	string t;
	string w;
	cin >> s >> t >> w;
	vector<int> a;
	vector<int> b;
	vector<int> c;
	for (int i = 0; i < s.length(); ++i) {
		a.push_back(s[i] - '0');
	}
	for (int i = 0; i < t.length(); ++i) {
		b.push_back(t[i] - '0');
	}
	for (int i = 0; i < w.length(); ++i) {
		c.push_back(w[i] - '0');
	}

	int n = s.length();

	LL res = 0;
	vector<LL> no_carry_cnt_before(n, 1);
	vector<LL> carry_cnt_before(n, 0);
	for (int i = n-1; i >= 0; --i) {
		if (i == 0) {
			LL carry = (a[i] + b[i]) / 10;
			LL rem = (a[i] + b[i]) % 10;

			if (rem == c[i]) {
				if (carry == 0) {
					res += no_carry_cnt_before[i];
				}
			} else {
				++rem;
				carry += rem / 10;
				rem %= 10;
				if (rem == c[i]) {
					if (carry == 0) {
						res += carry_cnt_before[i];
					}
				}
			}
		} else {
			LL with_carry_cnt = 0;
			LL without_carry_cnt = 0;
			LL carry = (a[i] + b[i]) / 10;
			LL rem = (a[i] + b[i]) % 10;

			if (rem == c[i]) {
				if (carry > 0) {
					with_carry_cnt += no_carry_cnt_before[i];
				} else {
					without_carry_cnt += no_carry_cnt_before[i];
				}
			} else {
				++rem;
				carry += rem / 10;
				rem %= 10;
				if (rem == c[i]) {
					if (carry > 0) {
						with_carry_cnt += carry_cnt_before[i];
					} else {
						without_carry_cnt += carry_cnt_before[i];
					}
				}
			}
			
			res += without_carry_cnt;
			carry_cnt_before[i-1] += with_carry_cnt;
			no_carry_cnt_before[i-1] += without_carry_cnt;
		}
	}

	cout << res << '\n';

	return 0;
}