//  [cpp]
#include<bits/stdc++.h>
using namespace std;
void *wmem;
template<class T1, class T2> void sortA_L(int N, T1 a[], T2 b[], void *mem = wmem){
  int i;
  pair<T1, T2> *arr=(pair<T1, T2> *) mem;
  for(i=0;i<N;i++){
    arr[i].first = a[i];
    arr[i].second = b[i];
  }
  sort(arr, arr+N);
  for(i=0;i<N;i++){
    a[i] = arr[i].first;
    b[i] = arr[i].second;
  }
}
void sortF_L(int N, unsigned A[], void *mem = wmem){
  int bt, i, m, *sz;
  unsigned *arr, c;
  if(N < 256){
    sort(A, A+N);
    return;
  }
  bt = sizeof(unsigned) * 8;
  arr = (unsigned*)mem;
  sz = (int*)(arr+N);
  for(m=0;m<bt;m+=8){
    for(i=0;i<257;i++){
      sz[i] = 0;
    }
    for(i=0;i<N;i++){
      sz[ 1+((A[i]>>m)&255u) ]++;
    }
    for(i=1;i<257;i++){
      sz[i] += sz[i-1];
    }
    for(i=0;i<N;i++){
      c = ((A[i]>>m)&255u);
      arr[sz[c]++] = A[i];
    }
    swap(A, arr);
  }
}
void sortF_L(int N, int A[], void *mem = wmem){
  int *arr, i, x, y, z;
  unsigned *send;
  if(N < 256){
    sort(A, A+N);
    return;
  }
  send = (unsigned*)A;
  sortF_L(N, send, mem);
  if(A[0] < 0 || A[N-1] >= 0){
    return;
  }
  x = 0;
  y = N;
  while(x < y){
    z = (x+y) / 2;
    if(A[z] < 0){
      y = z;
    }
    else{
      x = z+1;
    }
  }
  arr = (int*)mem;
  z = 0;
  for(i=x;i<N;i++){
    arr[z++] = A[i];
  }
  for(i=0;i<x;i++){
    arr[z++] = A[i];
  }
  for(i=0;i<N;i++){
    A[i] = arr[i];
  }
}
void sortF_L(int N, unsigned long long A[], void *mem = wmem){
  int bt, i, m, *sz;
  unsigned c;
  unsigned long long *arr;
  if(N < 512){
    sort(A, A+N);
    return;
  }
  bt = sizeof(unsigned long long) * 8;
  arr = (unsigned long long*)mem;
  sz = (int*)(arr+N);
  for(m=0;m<bt;m+=8){
    for(i=0;i<257;i++){
      sz[i] = 0;
    }
    for(i=0;i<N;i++){
      sz[ 1+((A[i]>>m)&255u) ]++;
    }
    for(i=1;i<257;i++){
      sz[i] += sz[i-1];
    }
    for(i=0;i<N;i++){
      c = ((A[i]>>m)&255u);
      arr[sz[c]++] = A[i];
    }
    swap(A, arr);
  }
}
void sortF_L(int N, long long A[], void *mem = wmem){
  int i, x, y, z;
  long long *arr;
  unsigned long long *send;
  if(N < 512){
    sort(A, A+N);
    return;
  }
  send = (unsigned long long*)A;
  sortF_L(N, send, mem);
  if(A[0] < 0 || A[N-1] >= 0){
    return;
  }
  x = 0;
  y = N;
  while(x < y){
    z = (x+y) / 2;
    if(A[z] < 0){
      y = z;
    }
    else{
      x = z+1;
    }
  }
  arr = (long long*)mem;
  z = 0;
  for(i=x;i<N;i++){
    arr[z++] = A[i];
  }
  for(i=0;i<x;i++){
    arr[z++] = A[i];
  }
  for(i=0;i<N;i++){
    A[i] = arr[i];
  }
}
inline void rd(int &x){
  int k, m=0;
  x=0;
  for(;;){
    k = getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
inline void wt_L(char a){
  putchar_unlocked(a);
}
inline void wt_L(long long x){
  char f[20];
  int m=0, s=0;
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    putchar_unlocked('-');
  }
  while(s--){
    putchar_unlocked(f[s]+'0');
  }
}
char memarr[96000000];
int N;
int M;
int A[100000];
int B[100000];
int C[100000];
int main(){
  int i, j, k;
  long long res;
  wmem = memarr;
  rd(N);
  rd(M);
  {
    int Lj4PdHRW;
    for(Lj4PdHRW=0;Lj4PdHRW<N;Lj4PdHRW++){
      rd(A[Lj4PdHRW]);
    }
  }
  {
    int KL2GvlyY;
    for(KL2GvlyY=0;KL2GvlyY<M;KL2GvlyY++){
      rd(B[KL2GvlyY]);
      rd(C[KL2GvlyY]);
    }
  }
  sortF_L(N,A);
  sortA_L(M,C,B);
  i = 0;
  for(j=M-1;j>=0;j--){
    int Q5VJL1cS;
    for(Q5VJL1cS=0;Q5VJL1cS<B[j];Q5VJL1cS++){
      if(i==N || A[i] >= C[j]){
        break;
      }
      A[i++] = C[j];
    }
    if(i==N || A[i] >= C[j]){
      break;
    }
  }
  res = 0;
  for(i=0;i<N;i++){
    res += A[i];
  }
  wt_L(res);
  wt_L('\n');
  return 0;
}
// cLay varsion 20190526-1

// --- original code ---
// int N, M, A[1d5], B[1d5], C[1d5];
// {
//   int i, j, k;
//   ll res;
// 
//   rd(N,M,A(N),(B,C)(M));
//   sortF(N,A);
//   sortA(M,C,B);
// 
//   i = 0;
//   for(j=M-1;j>=0;j--){
//     rep(B[j]){
//       if(i==N || A[i] >= C[j]) break;
//       A[i++] = C[j];
//     }
//     if(i==N || A[i] >= C[j]) break;
//   }
// 
//   res = 0;
//   rep(i,N) res += A[i];
//   wt(res);
// }