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#include<stdio.h>
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#include<math.h>
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int fun(int a)
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{
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int ans = 0;
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for(int i = 2; i <= sqrt(a); i++)
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{
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if(a%i==0)
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{
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ans = 1;
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break;
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}
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}
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return ans;
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}
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int main()
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{
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int a;
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scanf("%d",&a);
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int ans = fun(a);
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if(ans == 1) printf("NO");
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else printf("YES");
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} |
