#include <stdio.h>
int dp[1001];
int num[1001];
int max(int a,int b) {
return a>b ? a:b;
}
int bottom_up(int n) {
int res=0;
for(int i=1; i<=n; i++) {
dp[i]=1;
for(int j=1; j<=i-1; j++) {
if(num[i]<num[j]) {
dp[i]=max(dp[i],dp[j]+1);
}
}
res=max(dp[i],res);
}
return res;
}
int main() {
int n;
scanf("%d",&n);
for(int i=1; i<=n; i++) {
scanf("%d",&num[i]);
}
printf("%d",bottom_up(n));
return 0;
}
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