12 lines
218 B
C
12 lines
218 B
C
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#include <stdio.h>
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int main(void){
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double height;
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scanf("%lf",&height);
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double days = height / 5;
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if(days - (int)days > 10e-6) printf("%d",(int)days+1);
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else printf("%d",(int)days-1);
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printf("\n");
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return 0;
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}
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