num=list(map(int,input().split()))
a=list(map(int,input().split()))
N=1000003
total=0
mod=1
n=num[0]
for i in range(num[1]):
    if mod*(n**a[i])>N:
        mod=(n**a[i])%N
        total+=mod
        if i!=num[1]-1:
            a[i+1]=a[i+1]-a[i]
    else:
        total+=n**a[i]
        mod=1
        
    
print(total%N)