#include <stdio.h>
#include <memory.h>
#include <list>
#include <algorithm>

using namespace std;

const char infile[] = "tricouri.in";
const char outfile[] = "tricouri.out";

const int MAXN = 300005;
const int oo = 0x3f3f3f3f;

const inline int min(const int &a, const int &b) { if( a > b ) return b;   return a; }
const inline int max(const int &a, const int &b) { if( a < b ) return b;   return a; }
const inline void Get_min(int &a, const int b)    { if( a > b ) a = b; }
const inline void Get_max(int &a, const int b)    { if( a < b ) a = b; }

int N, M, K, P, dp[6][21], v[105], A[MAXN];
list<int> linkedList[21][21];

struct classComp {
    inline bool operator () (const int &a, const int &b) {
        return a > b;
    }
};

int main() {
    freopen(infile, "r", stdin);
    freopen(outfile, "w", stdout);
    scanf("%d %d", &N, &M);
    for(int i = 1 ; i <= N ; ++ i)
        scanf("%d", &A[i]);
    sort(A + 1, A + N + 1, classComp());
    for(int i = 1 ; i <= N ; ++ i)
        for(int j = 2 ; j <= 20 ; ++ j)
            if(linkedList[j][A[i] % j].size() < 5)
                linkedList[j][A[i] % j].push_back(A[i]);
    for(int q = 1 ; q <= M ; ++ q) {
        scanf("%d %d", &K, &P);
        for(int i = 0 ; i <= 5 ; ++ i)
            for(int j = 0 ; j <= 20 ; ++ j)
                dp[i][j] = 0;
        v[0] = 0;
        for(int rest = 0 ; rest < P ; ++ rest)
            for(list <int> :: iterator it = linkedList[P][rest].begin(), fin = linkedList[P][rest].end();
            it != fin ; ++ it)
            v[ ++ v[0] ] = *it;
        for(int i = 1 ; i <= v[0] ; ++ i) {
            for(int k = K - 1 ; k >= 0 ; -- k)
                for(int rest = 0 ; rest < P ; ++ rest)
                    if(dp[k][rest])
                        Get_max(dp[k + 1][(rest + v[i]) % P], dp[k][rest] + v[i]);
            if(dp[1][v[i] % P] == 0)
                dp[1][v[i] % P] = v[i];
        }
        printf("%d\n", ((dp[K][0] == 0) ? -1 : dp[K][0]));
    }
    return 0;
}