N,M=map(int,input().split()) A=list(map(int,input().split())) for i in range(M): A[i]-=1 dp=[[10**10]*N for i in range(M+1)] for j in range(N): dp[M][j]=j for i in range(M,0,-1): for j in range(N): for k in range(N): if k<=j: if k<=A[i-1]