Первая задача

#include <iostream>
using namespace std;
int main() {
	int InputNumber = 0;
	int count = 0;
	for(int i = 0; i < 4; i++){
	    cin >> InputNumber;
	    if(InputNumber % 7 == 0){
	        count++;
	    }
	}
	cout << count;
	return 0;
}

Вторая задача 

#include <iostream>
using namespace std;
int main() {
	int InputNumber = 0;
	int count = 0;
	for(int i = 0; i < 4; i++){
	    cin >> InputNumber;
	    if(InputNumber % 6 == 0){
	        count++;
	    }
	}
	if(count >= 2){
		cout << "Yes";
	}
	else cout << "NO";
	return 0;
}

Третья задача

#include <iostream>
using namespace std;
int main() {
	int InputNumber = 0;
	int count = 0;
	int QuantityNumbers = 0;
	cin >> QuantityNumbers;
	for(int i = 0; i < QuantityNumbers; i++){
	    cin >> InputNumber;
	    if(InputNumber % 5 == 2) {
	        count++;
	    }
	}
	cout << count;
	return 0;
}

Четвёртая задача

#include <iostream>
using namespace std;
int main() {
	int InputNumber = 0;
	int count = 0;
	int QuantityNumbers = 0;
	cin >> QuantityNumbers;
	for(int i = 0; i < QuantityNumbers; i++){
	    cin >> InputNumber;
	    if(InputNumber % 7 == 3) {
	        count++;
	    }
	}
	if(count >= 2){
		cout << "Yes";
	}
	else cout << "No";
	return 0;
}

Пятая задача

#include <iostream>
using namespace std;
int main() {
	int InputNumber = 0;
	int count = 0;
	for(int i = 0; i < 5; i++){
	    cin >> InputNumber;
	    if(InputNumber > 0) {
	        count++;
	    }
	}
	cout << count;
	return 0;
}

Шестая задача

#include <iostream>
using namespace std;
int main() {
	int InputNumber = 0;
	int count = 0;
	int QuantityNumbers = 0;
	cin >> QuantityNumbers;
	for(int i = 0; i < QuantityNumbers; i++){
	    cin >> InputNumber;
	    if(InputNumber >= -3 && InputNumber <= 9) {
	        count++;
	    }
	}
	cout << count;
	return 0;
}