#include <cstdio>

long long cit() {
    long long ans = 0;
    char c = getchar();
    bool neg = false;
    while (c < '0' || c > '9') {
        if (c == '-') {
            c = getchar();
            neg = true;
            break;
        }
        c = getchar();
    }
    while (c >= '0' && c <= '9') {
        ans = (ans << 3) + (ans << 1) + (c - '0');
        c = getchar();
    }
    return (neg) ? -ans : ans;
}

void afis(long long n) {
    int l = 0;
    char c[20];
    if (n == 0) {
        putchar('0');
    }
    if (n < 0) {
        putchar('-');
        n = -n;
    }
    while (n > 0) {
        c[l++] = n % 10 + '0';
        n /= 10;
    }
    for (int i = l - 1; i >= 0; i--) {
        putchar(c[i]);
    }
    putchar('\n');
}

int main() {
    int n = cit(), k = cit(), a = cit(), b = cit(), v[500005];
    v[0] = cit();
    v[0] %= k;
    for (int i = 1; i < n; i++) {
        int aux = cit();
        v[i] = (v[i - 1] + aux) % k;
    }
    long long ans = 0;
    for (int i = a - 1; i < b; i++) {
        if (v[i] == 0) {
            ans++;
        }
    }
    for (int i = 0; i < n - a; i++) {
        for (int j = i + a; j < n && j <= i + b; j++) {
            if (v[j] == v[i]) {
                ans++;
            }
        }
    }
    afis(ans);

    return 0;
}