24 lines
432 B
C++
24 lines
432 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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const int N = 100;
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int a[N] = {0};
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char s[N];
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cin >> s;
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//字符串的长度
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int length = strlen(s);
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for (int i = 0; i < length; ++i) {
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a[i] = s[i] - '0';
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}
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int sum = 0;
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for (int i = 0; i < length; i++) {
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sum += a[i] * pow(2, length - i - 1);
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}
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cout << sum << endl;
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return 0;
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}
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