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#include <stdio.h>
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#include <math.h>//ʹsqrt<72><74><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int prime(int n)
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{
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int i ,m = 0;
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if(n==0||n==1)//<2F>ж<EFBFBD>0<EFBFBD><30>1<EFBFBD><31><EFBFBD><EFBFBD><EFBFBD>
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return 0;
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else
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{
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for (i = 2; i <= sqrt(n); i++)//<2F><><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><D4AD>Ϊһ<CEAA><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD>ƽ<EFBFBD><C6BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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{
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if (n%i == 0)
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{
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m++;//m<><6D>Ϊ0ʱ˵<CAB1><CBB5>n<EFBFBD><6E><EFBFBD><EFBFBD>1<EFBFBD><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD>б<EFBFBD><D0B1><EFBFBD><EFBFBD><EFBFBD>ӣ<EFBFBD><D3A3><EFBFBD><EFBFBD>Բ<EFBFBD><D4B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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}
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}
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if(m==0)
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{
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return 1;
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}
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else
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{
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return 0;
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}
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}
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}
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int main()
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{
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int num = 0;
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scanf("%d", &num);
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if (prime(num))//<2F><><EFBFBD><EFBFBD>prime<6D><65><EFBFBD><EFBFBD>
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{
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printf("Yes");
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}
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else
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printf("No");
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return 0;
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}
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