#include<stdio.h> #include<math.h> int main() { int s[31] = { 0 }, j = 0; char ch; for (int i = 0; i < 30;i++) { scanf("%c",&ch); if (ch >= '0' && ch <= '9') { s[j] = ch - 48; j++; } else if (ch == ' ') { i = i - 1; continue; } else if (ch == '\n') { break; } } int cnt = j; int cnt1 = pow(2,j-1); int sum[20] = { 0 }; int i = 0; for (j; j >= 0; j--) { sum[i] = sum[i] + s[j] * cnt1; for (int k = 0; k < 19; k++) { while (sum[k] >= 10) { sum[k] = sum[k] - 10; sum[k + 1]++; } } } for (int k = 19; k >= 0; k--) { if (sum[k] != 0) { for (int l = k; l >= 0; l--) { printf("%d", sum[l]); } } } return 0; }