31 lines
342 B
C
31 lines
342 B
C
#include <stdio.h>
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//Ãݴη½
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int power(int n){
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int s = 1, i;
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for(i=1;i<=n;i++){
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s *= 2;
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}
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return s;
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}
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//½×³Ë
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int factorial(int n){
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int s = 1, i;
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for(i=1;i<=n;i++){//1~n
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s*=i;
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}
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return s;
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}
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int main(){
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int n, i, s = 0;
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scanf("%d", &n);
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for(i=1;i<=n;i++){
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s += power(i) * factorial(i);
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}
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printf("%d\n", s);
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return 0;
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}
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