#include<bits/stdc++.h> using namespace std; bool getbit(int num, int bit) { return (num >> bit)&1; } int flipbit(int num, int bit) { return num ^ (1 << bit); } int a[25], b[25], val[20005], dp[1 << 20]; bool valid(int x, int y) { return val[x+1] == val[x+y]; } int main() { int m, n; cin>>m>>n; for(int i = 1; i <= m; i++) cin>>a[i]; for(int i = 1; i <= n; i++) cin>>b[i]; int cur = 0; for(int i = 1; i <= m; i++){ for(int j = cur+1; j <= cur+a[i]; j++) val[j] = i; cur += a[i]; } dp[0] = 1; bool ok = 0; for(int i = 0; i < (1 << n); i++) if(dp[i] == 1){ int sum = 0; for(int j = 0; j < n; j++) if(getbit(i, j) == 1) sum += b[j+1]; for(int j = 0; j < n; j++) if(getbit(i, j) == 0 && valid(sum, b[j+1]) == 1){ dp[flipbit(i, j)] = 1; } if(sum == cur) ok = 1; } if(ok == 1) cout<<"YES"; else cout<<"NO"; }