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#include <cstdio>
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int que[1001],head,tail,m,n,cnt;
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bool mem[1001];
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int main()
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{
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scanf("%d%d",&m,&n);
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for(int i=0,x; i<n; i++)
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{
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scanf("%d",&x);
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if(mem[x]) continue;
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if(tail-head==m) mem[que[head++]]=false;
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mem[que[tail++]=x]=true;
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cnt++;
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}
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printf("%d",cnt);
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return 0;
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}
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