#include <stdio.h>
long long int dp[36] = {1};
int main(){
int n;
scanf("%d", &n);
dp[0] = 1;
dp[1] = 1;
for(int i = 2; i <= 35; i++){
for(int j = 0; j < i; j++ ){
dp[i] += dp[j] * dp[i-j-1];
}
}
printf("%lld\n", dp[35]);
return 0;
}
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