20 lines
312 B
C
20 lines
312 B
C
#include <stdio.h>
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int main() {
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int N;
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scanf("%d",&N);
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int three, five = N/5;
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while(five!=-1) {
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if( (N-five*5)%3 == 0 ) {
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three = (N-five*5)/3;
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printf("%d\n",three+five);
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return 0;
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}
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five--;
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}
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printf("-1\n");
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return 0;
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} |