Hi guys , I just solved the first problem of round 381 , Hope you like it , feel free to comment any better solution .

#include<stdio.h>

int main() {

int n,a[5]={0};

scanf(“%d %d %d %d”,&n,&a[1],&a[2],&a[3]);

if (a[3]+a[3]<a[1]-a[3]) a[1]=a[3]+a[3]+a[3];

if (a[3]+a[2]<a[1]) a[1]=a[3]+a[2];

if (a[3]+a[3]<a[2]) a[2]=a[3]+a[3];

if (a[1]+a[1]<a[2]) a[2]=a[1]+a[1];

if (a[1]+a[2]<a[3]) a[3]=a[1]+a[2];

a[4]=0;

printf(“%d\n”,a[4-n%4]);

return 0;

}