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24 lines
458 B
24 lines
458 B
#include <cstdio>
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#include <cstdint>
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#include <cassert>
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int main()
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{
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uint64_t N;
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while (scanf("%lu\n", &N) != EOF)
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{
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uint64_t cmp = 1;
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unsigned cmp_i = 1;
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for (; cmp % N != 0 ;)
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{
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/*
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* 11 = d+r
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* 111 mod d === (d+r)*10 + 1 mod d === r10 + 1 mod d
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*/
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cmp = (cmp % N) * 10 + 1;
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++cmp_i;
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}
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printf("%u\n", cmp_i);
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}
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}
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