void decentNumber(int n) {
    int three = ((3 - (n % 3)) % 3 ) * 5;
    if(three > n) cout << -1;
    else cout << string(n - three, '5') << string(three, '3');
    cout << endl;
}

def decentNumber(n):    
    if n in [1,2,4,7]:
        print(-1)
    elif n % 3 == 0:
        print('5'*n)
    elif n%5 == 0 and (n-5) % 3 != 0 and (n-10) % 3 != 0:
        print('3'*n)
    elif (n-5) % 3 == 0:
        print('5'*(n-5) + '3'*5)
    elif (n-10) % 3 == 0:
        print('5'*(n-10) + '3'*10)   

def decentNumber(n):
    if  n in (1,2,4,7): print(-1); return
    threes = (0, 10, 5)[n%3]
    print('5'*(n-threes)+'3'*threes)

def decentNumber(n):
    if n in [1, 2, 4, 7]:
        print('-1')
    else:
        i = 0
        while n % 3 != 0:
            n -= 5
            i += 5
        print('5' * n + '3' * i)

void decentNumber(int n) {
    if (n == 1){cout << "-1" << endl; return;}
    long number5 = 0, number3 = 0;
    bool flag = false;
    for (int i = n; i >= 0; i--){
        if (i % 3 == 0 && (n-i) % 5 == 0){
            number3 = n-i; number5 = i;
            flag = true; break;
        }
    }
    if (flag == false){cout <<  "-1" << endl;return;}
    for (long i = 0; i < number5; i++)cout << "5";
    for (long i = 0; i < number3; i++)cout << "3";
    cout << endl;
}