25 lines
378 B
C
25 lines
378 B
C
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#include <stdio.h>
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int main(void) {
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// Initialize variables and get input
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long long sum = 0;
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long long n;
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scanf("%lld", &n);
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// if n is smaller than 3
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if (n < 3) {
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printf("0");
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return 0;
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}
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// Iterate through all
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for (long long i = 3; i < n; i++) {
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sum += i * (i - 1) * (i - 2);
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}
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// Print the result
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printf("%lld\n", sum);
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return 0;
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}
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