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#include <iostream>
#include <vector>
#include <string>
#include <numeric>
using namespace std;

int vector_to_int(vector<int> vec, int start, int end)
{
    int result = 0;
    for (int i = start; i <= end; i++) {
        result = 10 * result + vec[i];
    }
    return result;
}

int main() {
    string s;
    cin >> s;

    vector<int> v1, v2, sum;

    for (char c : s) {
        v1.push_back(c - '0');
    }

    cin >> s;

    for (char c : s) {
        v2.push_back(c - '0');
    }

    cin >> s;

    for (char c : s) {
        sum.push_back(c - '0');
    }

    int result = 0;

    for (int i = 0; i < v1.size(); i++)
    {
        for (int j = i; j < v1.size(); j++)
        {
            int i1 = vector_to_int(v1, i, j);
            int i2 = vector_to_int(v2, i, j);

            int sumToCompare = vector_to_int(sum, i, j);

            if (i1 + i2 == sumToCompare)
            {
                result += 1;
            }
        }
    }

    cout << result;
}