#include <cstdio>
#include <functional>
using namespace std;

const int MAXN = 1e5 + 10;

int n, m;
int a[MAXN], ok[MAXN];

bool check(int x) {
	while (x) {
		if (x % 10 != 4 && x % 10 != 7) {
			return false;
		}
		x /= 10;
	}
	return true;
}

void Work1() {
	while (m--) {
		char op[10];
		int l, r, d;
		scanf("%s %d %d", op, &l, &r);
		if (op[0] == 'a') {
			scanf("%d", &d);
			for (int i = l; i <= r; ++i) {
				a[i] += d;
				ok[a[i]] = check(a[i]);
			}
		} else {
			int ans = 0;
			for (int i = l; i <= r; ++i) {
				if (ok[a[i]]) {
					ans++;
				}
			}
			printf("%d\n", ans);
		}
	}
}

int main() {
	freopen("cf121e.in", "r", stdin);
	freopen("cf121e.out", "w", stdout);
	scanf("%d %d", &n, &m);
	for (int i = 1; i <= n; ++i) {
		scanf("%d", &a[i]);
		ok[a[i]] = check(a[i]);
	}
	if (n <= 1000) {
		Work1();
	} else {
		Work1();
	}
	return 0;
}