#include <bits/stdc++.h>
#include <cstring>
#include <cstdio>
#pragma GCC optimize ("O3")
#define din cin
#define dout out
#define pi 3.14159265359
#define sw(x,y) x^=y,y^=x,x^=y
#define bmin(a,b)((a<b)?(a):(b))
#define bmax(a,b)((a>b)?(a):(b))
#define bminify(a,b)a=bmin(a,b)
#define bmaxify(a,b)a=bmax(a,b)
#define fto(i,ii,n)for(i=ii;i<n;i++)
#define f first
#define s second
#define mod 2000003ll
#define nmax 1501
#define lim 351
using namespace std;
typedef long long ll;
ifstream in("tricouri.in");
ofstream out("tricouri.out");
//FILE *fin=fopen("infasuratoare.in","r");
//FILE *fout=fopen("infasuratoare.out","w");
mt19937 e(8);
int n,i,j,k,l,x,y,m,a[nmax],p,t[6][20],z;
int main()
{
in>>n>>m;for(i=0;i<n;i++)in>>a[i];
while(m--){
    in>>k>>p;for(i=0;i<6;i++)for(j=0;j<p;j++)t[i][j]=-1<<20;t[0][0]=0;
    for(z=0;z<n;z++)for(i=k;i;i--)for(j=0;j<p;j++)bmaxify(t[i][(j+a[z])%p],t[i-1][j]+a[z]);
    out<<max(t[k][0],-1)<<'\n';
}
}