#include <stdio.h>
#include <stdlib.h>
#include <string.h>
double text2double(const char *p) {
if (v) *v = '.';
}
int main(void) {
double x, y = 0;
char buf[100];
while (fgets(buf
, sizeof buf
, stdin
)) { x = text2double(buf);
y += x;
}
return 0;
}
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