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9 lines
168 B
C++
9 lines
168 B
C++
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#include <stdio.h>
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int main(){
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int n;
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while(~scanf("%d",&n)){
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printf("%d\n",n*n*(n-1)/2*(n*n*n-2)+n*n*n*(n*n-5)/2+2*n*n);
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}
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return 0;
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}
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